| Frank Klaus | |
| Realname: | Francis Klaus |
| Nickname: | The Braddock Bearcat |
| Weight: | Middleweight |
| Nationality: | American |
| Birth Date: | December 30, 1887 |
| Birth Place: | Turtle Creek, Pennsylvania |
| Death Place: | Pittsburgh, Pennsylvania |
| Total: | 96 |
| Wins: | 67 |
| Ko: | 21 |
| Losses: | 15 |
| Draws: | 14 |
Frank Klaus (December 30, 1887, in Turtle Creek, Pennsylvania – February 8, 1948) was an American boxer from 1904 to 1918. Known as the Braddock Bearcat,[1] Klaus claimed the vacant World Middleweight Championship in 1913 and was elected to the Ring Boxing Hall of Fame in 1974.
Gifted with a strong punch, he lost exceptionally few fights in his nine-year career, and was knocked out only once. Nat Fleischer ranked Klaus sixth as the All-Time Middleweight. His manager was George Engel.[2] [3] [4]
Frank Klaus was born on December 30, 1887, to German-American parents in Turtle Creek, Pennsylvania, near Pittsburgh. He worked as a young man at the Westinghouse Machine Shop, and also mined coal with his father.
He started boxing training early and after winning an amateur tournament at East Pittsburgh's Wilmerding Athletic Club was recognized to have boxing promise by local boxing mentor George Engel.[5] He began his amateur career as early as 1904, and in February 1905 had three round wins on points in Pittsburgh against Frank Walton, and James Harris.[6] [7]
On October 18, 1911, Klaus defeated the great contender Leo Houck in a newspaper win by both the Philadelphia Item and the Philadelphia Record. During his career, the Pennsylvania-born middleweight fought some of the greatest welter, middle, and light heavyweights of his era, including Jack Dillon, Battling Levinsky, Mike Gibbons, Harry Greb, and Al McCoy.[3]
Klaus claimed the World Middleweight Title a few years after it became vacant upon the death of Stanley Ketchel in October 1910. Several contenders competed for the title. Accounts vary as to when Klaus was officially champion, but Klaus himself first claimed the title after defeating Sailor Ed Petrosky in a 20-round points decision in San Francisco on February 22, 1912. His victories over Jack Dillon, and later fellow claimant Georges Carpentier and former champion Billy Papke in France, cemented his claim to the title. He was officially recognized as champion by sanctioning bodies on March 5, 1913.[3]
In his historic title bout against Georges Carpentier on June 24, 1912, in Dieppe, France, Klaus won on a nineteenth round disqualification when Carpentier's manager entered the ring to protest his boxer being elbowed repeatedly by Klaus.[3] Carpentier's manager tried to pull his fighter from the ring by his waist, but the boxer's second had already thrown in the towel.[8]
On September 9, 1912, Klaus defeated Marcel Moreau in Savoie, France as the result of a low blow foul in the fourth of fifteen rounds. Moureau had held the French Middleweight Title in May 1908.[3]
In a title fight that led to world title recognition, Klaus defeated American Billy Papke at the Cirque du Paris on March 5, 1913, in a fifteenth-round disqualification. The referee stopped the fight in the fifteenth as a result of Papke continually ignoring his requests to fight cleanly. Klaus was winning by a significant margin. Papke had been warned throughout the fight for flagrant violations of boxing rules. Klaus received a gold belt for the victory.[9]
In another important win that cemented his claim to the title, Klaus defeated contender Eddie McGoorty on May 24, 1913, in a six-round bout in Pittsburgh. The Pittsburgh Gazette gave Klaus five of the six rounds.[3]
On July 1, 1913, Klaus had an important win where he was awarded a third-round TKO against Jimmy Gardner in Boston. Gardner had contended for the World Welterweight Championship earlier in his career. Gardner put up a great defense until the end of the second round, when Klaus threw some hard punches over the defenses of Gardner. After Klaus continued to connect with hard blows, a second of Gardner's jumped into the ring in the middle of the third round to end the fight.[10] Klaus had faced Gardner on at least three previous occasions.[3]
During a title fight on 11 October 1913, George Chip baffled the crowd when he knocked out Klaus with a strong right hook to the jaw. The knockout came near the end of the sixth and final round. Prior to the knockout, in the first five rounds, Chip never threatened to take the lead. The fight occurred at the old Pittsburgh City Hall at Market Square http://www.post-gazette.com/sports_headlines/19991128mchugh4.asp. It was the first loss by knockout in Klaus's career. The extra weight Klaus was carrying in his midsection led many reporters to believe he had not trained adequately for the bout, and had underestimated the ability of his opponent.[11] [12]
In a return non-title match on December 23, 1913, Chip defeated Klaus again. In the fifth round of six, the referee stopped the fight resulting in a technical knockout after Chip knocked Klaus to the mat for a second time.[3] In what most considered a decisive win, the Scranton Truth wrote that Chip was the master of Klaus in every way, and clearly deserved the title he had taken from him two months earlier.[13]
Klaus retired from boxing at age 26 shortly after his second loss to George Chip.
Klaus died February 8, 1948, at his home in Pittsburgh, Pennsylvania after a severe heart attack. He was survived by his widow, two sons and three daughters.[6]
All information in this section is derived from BoxRec,[14] unless otherwise stated.
All newspaper decisions are officially regarded as “no decision” bouts and are not counted in the win/loss/draw column
| Result | Record | Opponent | Type | Round | Date | Location | Notes | |
|---|---|---|---|---|---|---|---|---|
| 96 | Loss | 32–6–2 | George Chip | TKO | 5 (6) | Dec 23, 1913 | ||
| 95 | Loss | 32–5–2 | George Chip | TKO | 6 (6) | Oct 11, 1913 | ||
| 94 | Draw | 32–4–2 | Eddie McGoorty | NWS | 10 | Sep 29, 1913 | ||
| 93 | Win | 32–4–2 | Jimmy Gardner | TKO | 3 (12) | Jul 1, 1913 | ||
| 92 | Loss | 31–4–2 | Jack Dillon | NWS | 10 | May 29, 1913 | ||
| 91 | Win | 31–4–2 | Eddie McGoorty | NWS | 6 | May 24, 1913 | ||
| 90 | Win | 31–4–2 | Billy Papke | DQ | 15 (20) | Mar 5, 1913 | ||
| 89 | Win | 30–4–2 | Pietro Boine | DQ | 3 (?) | Sep 16, 1912 | ||
| 88 | Win | 29–4–2 | Marcel Moreau | DQ | 4 (15) | Sep 9, 1912 | ||
| 87 | Win | 28–4–2 | Georges Carpentier | DQ | 19 (20) | Jun 24, 1912 | ||
| 86 | Win | 27–4–2 | Jack Dillon | NWS | 10 | May 3, 1912 | ||
| 85 | Win | 27–4–2 | Jack Dillon | PTS | 20 | Mar 23, 1912 | ||
| 84 | Win | 26–4–2 | Sailor Ed Petroskey | PTS | 20 | Feb 22, 1912 | ||
| 83 | Win | 25–4–2 | George Knockout Brown | NWS | 6 | Jan 29, 1912 | ||
| 82 | Win | 25–4–2 | Jimmy Howard | NWS | 6 | Jan 15, 1912 | ||
| 81 | Draw | 25–4–2 | Jack Dillon | NWS | 6 | Dec 6, 1911 | ||
| 80 | Win | 25–4–2 | Leo Houck | NWS | 6 | Oct 18, 1911 | ||
| 79 | Win | 25–4–2 | Tommy Sullivan | KO | 2 (12) | Oct 12, 1911 | ||
| 78 | Win | 24–4–2 | Cyclone Johnny Thompson | NWS | 10 | Aug 17, 1911 | ||
| 77 | Win | 24–4–2 | Vic Hansen | KO | 8 (20) | Jul 1, 1911 | ||
| 76 | Win | 23–4–2 | Montana Dan Sullivan | KO | 3 (20) | Jun 15, 1911 | ||
| 75 | Win | 22–4–2 | Bill MacKinnon | NWS | 6 | May 6, 1911 | ||
| 74 | Win | 22–4–2 | Jimmy Gardner | NWS | 6 | Apr 11, 1911 | ||
| 73 | Win | 22–4–2 | Montana Jack Sullivan | TKO | 3 (10) | Mar 28, 1911 | ||
| 72 | Win | 21–4–2 | Leo Houck | PTS | 12 | Feb 14, 1911 | ||
| 71 | Win | 20–4–2 | Willie Lewis | TKO | 6 (10) | Feb 7, 1911 | ||
| 70 | Draw | 19–4–2 | Jimmy Gardner | PTS | 12 | Jan 31, 1911 | ||
| 69 | Win | 19–4–1 | Billy Berger | NWS | 6 | Jan 11, 1911 | ||
| 68 | Loss | 19–4–1 | Hugo Kelly | PTS | 12 | Dec 20, 1910 | ||
| 67 | Win | 19–3–1 | Jack Abbott | TKO | 5 (6) | Dec 15, 1910 | ||
| 66 | Loss | 18–3–1 | Jimmy Gardner | PTS | 12 | Nov 29, 1910 | ||
| 65 | Loss | 18–2–1 | Leo Houck | NWS | 6 | Oct 29, 1910 | ||
| 64 | Win | 18–2–1 | Frank Mantell | NWS | 6 | Sep 28, 1910 | ||
| 63 | Win | 18–2–1 | Jimmy Gardner | PTS | 12 | Apr 12, 1910 | ||
| 62 | Win | 17–2–1 | Frank Mantell | KO | 9 (12) | Mar 29, 1910 | ||
| 61 | Win | 16–2–1 | Stanley Ketchel | NWS | 6 | Mar 23, 1910 | ||
| 60 | Win | 16–2–1 | Jack "Twin" Sullivan | PTS | 12 | Jan 18, 1910 | ||
| 59 | Win | 15–2–1 | Billy Berger | NWS | 6 | Jan 7, 1910 | ||
| 58 | Win | 15–2–1 | Porky Dan Flynn | PTS | 12 | Dec 21, 1909 | ||
| 57 | Loss | 14–2–1 | Joe Thomas | NWS | 6 | Dec 18, 1909 | ||
| 56 | Draw | 14–2–1 | Harry Lewis | NWS | 6 | Nov 27, 1909 | ||
| 55 | Win | 14–2–1 | Billy Papke | NWS | 6 | Nov 11, 1909 | ||
| 54 | Win | 14–2–1 | Jack Rowan | KO | 2 (6) | Oct 26, 1909 | ||
| 53 | Win | 13–2–1 | Hugh McGann | DQ | 3 (6) | Sep 17, 1909 | ||
| 52 | Loss | 12–2–1 | Hugo Kelly | NWS | 6 | Jun 25, 1909 | ||
| 51 | Win | 12–2–1 | Jack Fitzgerald | NWS | 6 | May 31, 1909 | ||
| 50 | Win | 12–2–1 | Harry Mansfield | TKO | 1 (6) | May 15, 1909 | ||
| 49 | Loss | 11–2–1 | Jim Smith | DQ | 2 (6) | May 15, 1909 | ||
| 48 | Win | 11–1–1 | Harry Lewis | DQ | 6 (6) | Apr 24, 1909 | ||
| 47 | Win | 10–1–1 | Harry Mansfield | NWS | 6 | Apr 5, 1909 | ||
| 46 | Win | 10–1–1 | Jack Williams | TKO | 2 (6) | Mar 18, 1909 | ||
| 45 | Win | 9–1–1 | Cy Flynn | TKO | 3 (6) | Mar 4, 1909 | ||
| 44 | Win | 8–1–1 | Harry Mansfield | NWS | 6 | Feb 18, 1909 | ||
| 43 | Win | 8–1–1 | Pat Carney | KO | 1 (6) | Feb 11, 1909 | ||
| 42 | Win | 7–1–1 | Jim Donovan | NWS | 6 | Feb 8, 1909 | ||
| 41 | Win | 7–1–1 | Tommy Crawford | TKO | 1 (6) | Jan 15, 1909 | ||
| 40 | Win | 6–1–1 | Tommy Lynch | NWS | 6 | Dec 23, 1908 | ||
| 39 | Win | 6–1–1 | Paul Moore | NWS | 6 | Dec 22, 1908 | ||
| 38 | Win | 6–1–1 | Billy Clark | KO | 2 (6) | Nov 28, 1908 | ||
| 37 | Win | 5–1–1 | Jack Fitzgerald | NWS | 6 | Nov 16, 1908 | ||
| 36 | Win | 5–1–1 | Kid Williams | KO | 5 (6) | Oct 30, 1908 | ||
| 35 | Win | 4–1–1 | Jim Donovan | NWS | 6 | Oct 24, 1908 | ||
| 34 | Win | 4–1–1 | Johnny Carroll | NWS | 6 | Sep 25, 1908 | ||
| 33 | Loss | 4–1–1 | Jack Robinson | NWS | 6 | Sep 16, 1908 | ||
| 32 | Draw | 4–1–1 | Billy Clark | NWS | 6 | Sep 12, 1908 | ||
| 31 | Win | 4–1–1 | Jack Robinson | NWS | 6 | Sep 11, 1908 | ||
| 30 | Win | 4–1–1 | Dutch Zimmer | KO | 3 (6) | Sep 8, 1908 | ||
| 29 | Win | 3–1–1 | Jim Donovan | NWS | 6 | Aug 26, 1908 | ||
| 28 | Win | 3–1–1 | Jack Nelson | NWS | 6 | May 29, 1908 | ||
| 27 | Win | 3–1–1 | Jack Fitzgerald | NWS | 6 | May 7, 1908 | ||
| 26 | Win | 3–1–1 | Cub White | NWS | 6 | May 4, 1908 | ||
| 25 | Draw | 3–1–1 | Billy Clark | NWS | 6 | Mar 28, 1908 | ||
| 24 | Win | 3–1–1 | Alex Laird | KO | 2 (6) | Mar 16, 1908 | ||
| 23 | Win | 2–1–1 | Paul Moore | NWS | 6 | Dec 10, 1907 | ||
| 22 | Loss | 2–1–1 | Dick Given | NWS | 6 | Oct 28, 1907 | ||
| 21 | Win | 2–1–1 | Andy Diamond | KO | 1 (6) | Sep 14, 1907 | ||
| 20 | Win | 1–1–1 | Al Martin | NWS | 6 | May 28, 1907 | ||
| 19 | Loss | 1–1–1 | Paul Moore | NWS | 6 | Jan 10, 1907 | ||
| 18 | Win | 1–1–1 | Jock Simcoe | NWS | 6 | Dec 20, 1906 | ||
| 17 | Draw | 1–1–1 | Paul Moore | NWS | 6 | Dec 11, 1906 | ||
| 16 | Win | 1–1–1 | James Frazier | NWS | 6 | Nov 12, 1906 | ||
| 15 | Win | 1–1–1 | Tom Broderick | TKO | 3 (6) | Oct 29, 1906 | ||
| 14 | Win | 0–1–1 | George Decker | NWS | 6 | Oct 9, 1906 | ||
| 13 | Draw | 0–1–1 | George Fraser | PTS | 32 (?) | Aug 25, 1906 | ||
| 12 | Draw | 0–1 | Jack Bruce | NWS | 4 | May 8, 1906 | ||
| 11 | Win | 0–1 | Ned Chernoff | NWS | 4 | Mar 26, 1906 | ||
| 10 | Draw | 0–1 | Mike Ward | NWS | 4 | Feb 27, 1906 | ||
| 9 | Win | 0–1 | Dick Given | NWS | 4 | Jan 25, 1906 | ||
| 8 | Draw | 0–1 | Frank Diamond | NWS | 6 | Jan 24, 1906 | ||
| 7 | Win | 0–1 | Jock Simcoe | NWS | 6 | Dec 14, 1905 | ||
| 6 | Loss | 0–1 | Elmer Morgan | KO | 4 (6) | Jul 27, 1905 | ||
| 5 | Win | 0–0 | Battling Simpson | NWS | 4 | Mar 27, 1905 | ||
| 4 | Draw | 0–0 | John Ulm | NWS | 4 | Mar 27, 1905 | ||
| 3 | Loss | 0–0 | Frank Diamond | NWS | 4 | Mar 4, 1905 | ||
| 2 | Loss | 0–0 | Frank Diamond | NWS | 4 | Feb 25, 1905 | ||
| 1 | Draw | 0–0 | Patsy Hogan | NWS | 4 | Feb 18, 1905 | ||
Record with the inclusion of newspaper decision in the win/loss/draw column.
| Result | Record | Opponent | Type | Round | Date | Location | Notes | |
|---|---|---|---|---|---|---|---|---|
| 96 | Loss | 68–15–13 | George Chip | TKO | 5 (6) | Dec 23, 1913 | ||
| 95 | Loss | 68–14–13 | George Chip | TKO | 6 (6) | Oct 11, 1913 | ||
| 94 | Draw | 68–13–13 | Eddie McGoorty | NWS | 10 | Sep 29, 1913 | ||
| 93 | Win | 68–13–12 | Jimmy Gardner | TKO | 3 (12) | Jul 1, 1913 | ||
| 92 | Loss | 67–13–12 | Jack Dillon | NWS | 10 | May 29, 1913 | ||
| 91 | Win | 67–12–12 | Eddie McGoorty | NWS | 6 | May 24, 1913 | ||
| 90 | Win | 66–12–12 | Billy Papke | DQ | 15 (20) | Mar 5, 1913 | ||
| 89 | Win | 65–12–12 | Pietro Boine | DQ | 3 (?) | Sep 16, 1912 | ||
| 88 | Win | 64–12–12 | Marcel Moreau | DQ | 4 (15) | Sep 9, 1912 | ||
| 87 | Win | 63–12–12 | Georges Carpentier | DQ | 19 (20) | Jun 24, 1912 | ||
| 86 | Win | 62–12–12 | Jack Dillon | NWS | 10 | May 3, 1912 | ||
| 85 | Win | 61–12–12 | Jack Dillon | PTS | 20 | Mar 23, 1912 | ||
| 84 | Win | 60–12–12 | Sailor Ed Petroskey | PTS | 20 | Feb 22, 1912 | ||
| 83 | Win | 59–12–12 | George Knockout Brown | NWS | 6 | Jan 29, 1912 | ||
| 82 | Win | 58–12–12 | Jimmy Howard | NWS | 6 | Jan 15, 1912 | ||
| 81 | Draw | 57–12–12 | Jack Dillon | NWS | 6 | Dec 6, 1911 | ||
| 80 | Win | 57–12–11 | Leo Houck | NWS | 6 | Oct 18, 1911 | ||
| 79 | Win | 56–12–11 | Tommy Sullivan | KO | 2 (12) | Oct 12, 1911 | ||
| 78 | Win | 55–12–11 | Cyclone Johnny Thompson | NWS | 10 | Aug 17, 1911 | ||
| 77 | Win | 54–12–11 | Vic Hansen | KO | 8 (20) | Jul 1, 1911 | ||
| 76 | Win | 53–12–11 | Montana Dan Sullivan | KO | 3 (20) | Jun 15, 1911 | ||
| 75 | Win | 52–12–11 | Bill MacKinnon | NWS | 6 | May 6, 1911 | ||
| 74 | Win | 51–12–11 | Jimmy Gardner | NWS | 6 | Apr 11, 1911 | ||
| 73 | Win | 50–12–11 | Montana Jack Sullivan | TKO | 3 (10) | Mar 28, 1911 | ||
| 72 | Win | 49–12–11 | Leo Houck | PTS | 12 | Feb 14, 1911 | ||
| 71 | Win | 48–12–11 | Willie Lewis | TKO | 6 (10) | Feb 7, 1911 | ||
| 70 | Draw | 47–12–11 | Jimmy Gardner | PTS | 12 | Jan 31, 1911 | ||
| 69 | Win | 47–12–10 | Billy Berger | NWS | 6 | Jan 11, 1911 | ||
| 68 | Loss | 46–12–10 | Hugo Kelly | PTS | 12 | Dec 20, 1910 | ||
| 67 | Win | 46–11–10 | Jack Abbott | TKO | 5 (6) | Dec 15, 1910 | ||
| 66 | Loss | 45–11–10 | Jimmy Gardner | PTS | 12 | Nov 29, 1910 | ||
| 65 | Loss | 45–10–10 | Leo Houck | NWS | 6 | Oct 29, 1910 | ||
| 64 | Win | 45–9–10 | Frank Mantell | NWS | 6 | Sep 28, 1910 | ||
| 63 | Win | 44–9–10 | Jimmy Gardner | PTS | 12 | Apr 12, 1910 | ||
| 62 | Win | 43–9–10 | Frank Mantell | KO | 9 (12) | Mar 29, 1910 | ||
| 61 | Win | 42–9–10 | Stanley Ketchel | NWS | 6 | Mar 23, 1910 | ||
| 60 | Win | 41–9–10 | Jack "Twin" Sullivan | PTS | 12 | Jan 18, 1910 | ||
| 59 | Win | 40–9–10 | Billy Berger | NWS | 6 | Jan 7, 1910 | ||
| 58 | Win | 39–9–10 | Porky Dan Flynn | PTS | 12 | Dec 21, 1909 | ||
| 57 | Loss | 38–9–10 | Joe Thomas | NWS | 6 | Dec 18, 1909 | ||
| 56 | Draw | 38–8–10 | Harry Lewis | NWS | 6 | Nov 27, 1909 | ||
| 55 | Win | 38–8–9 | Billy Papke | NWS | 6 | Nov 11, 1909 | ||
| 54 | Win | 37–8–9 | Jack Rowan | KO | 2 (6) | Oct 26, 1909 | ||
| 53 | Win | 36–8–9 | Hugh McGann | DQ | 3 (6) | Sep 17, 1909 | ||
| 52 | Loss | 35–8–9 | Hugo Kelly | NWS | 6 | Jun 25, 1909 | ||
| 51 | Win | 35–7–9 | Jack Fitzgerald | NWS | 6 | May 31, 1909 | ||
| 50 | Win | 34–7–9 | Harry Mansfield | TKO | 1 (6) | May 15, 1909 | ||
| 49 | Loss | 33–7–9 | Jim Smith | DQ | 2 (6) | May 15, 1909 | ||
| 48 | Win | 33–6–9 | Harry Lewis | DQ | 6 (6) | Apr 24, 1909 | ||
| 47 | Win | 32–6–9 | Harry Mansfield | NWS | 6 | Apr 5, 1909 | ||
| 46 | Win | 31–6–9 | Jack Williams | TKO | 2 (6) | Mar 18, 1909 | ||
| 45 | Win | 30–6–9 | Cy Flynn | TKO | 3 (6) | Mar 4, 1909 | ||
| 44 | Win | 29–6–9 | Harry Mansfield | NWS | 6 | Feb 18, 1909 | ||
| 43 | Win | 28–6–9 | Pat Carney | KO | 1 (6) | Feb 11, 1909 | ||
| 42 | Win | 27–6–9 | Jim Donovan | NWS | 6 | Feb 8, 1909 | ||
| 41 | Win | 26–6–9 | Tommy Crawford | TKO | 1 (6) | Jan 15, 1909 | ||
| 40 | Win | 25–6–9 | Tommy Lynch | NWS | 6 | Dec 23, 1908 | ||
| 39 | Win | 24–6–9 | Paul Moore | NWS | 6 | Dec 22, 1908 | ||
| 38 | Win | 23–6–9 | Billy Clark | KO | 2 (6) | Nov 28, 1908 | ||
| 37 | Win | 22–6–9 | Jack Fitzgerald | NWS | 6 | Nov 16, 1908 | ||
| 36 | Win | 21–6–9 | Kid Williams | KO | 5 (6) | Oct 30, 1908 | ||
| 35 | Win | 20–6–9 | Jim Donovan | NWS | 6 | Oct 24, 1908 | ||
| 34 | Win | 19–6–9 | Johnny Carroll | NWS | 6 | Sep 25, 1908 | ||
| 33 | Loss | 18–6–9 | Jack Robinson | NWS | 6 | Sep 16, 1908 | ||
| 32 | Draw | 18–5–9 | Billy Clark | NWS | 6 | Sep 12, 1908 | ||
| 31 | Win | 18–5–8 | Jack Robinson | NWS | 6 | Sep 11, 1908 | ||
| 30 | Win | 17–5–8 | Dutch Zimmer | KO | 3 (6) | Sep 8, 1908 | ||
| 29 | Win | 16–5–8 | Jim Donovan | NWS | 6 | Aug 26, 1908 | ||
| 28 | Win | 15–5–8 | Jack Nelson | NWS | 6 | May 29, 1908 | ||
| 27 | Win | 14–5–8 | Jack Fitzgerald | NWS | 6 | May 7, 1908 | ||
| 26 | Win | 13–5–8 | Cub White | NWS | 6 | May 4, 1908 | ||
| 25 | Draw | 12–5–8 | Billy Clark | NWS | 6 | Mar 28, 1908 | ||
| 24 | Win | 12–5–7 | Alex Laird | KO | 2 (6) | Mar 16, 1908 | ||
| 23 | Win | 11–5–7 | Paul Moore | NWS | 6 | Dec 10, 1907 | ||
| 22 | Loss | 10–5–7 | Dick Given | NWS | 6 | Oct 28, 1907 | ||
| 21 | Win | 10–4–7 | Andy Diamond | KO | 1 (6) | Sep 14, 1907 | ||
| 20 | Win | 9–4–7 | Al Martin | NWS | 6 | May 28, 1907 | ||
| 19 | Loss | 8–4–7 | Paul Moore | NWS | 6 | Jan 10, 1907 | ||
| 18 | Win | 8–3–7 | Jock Simcoe | NWS | 6 | Dec 20, 1906 | ||
| 17 | Draw | 7–3–7 | Paul Moore | NWS | 6 | Dec 11, 1906 | ||
| 16 | Win | 7–3–6 | James Frazier | NWS | 6 | Nov 12, 1906 | ||
| 15 | Win | 6–3–6 | Tom Broderick | TKO | 3 (6) | Oct 29, 1906 | ||
| 14 | Win | 5–3–6 | George Decker | NWS | 6 | Oct 9, 1906 | ||
| 13 | Draw | 4–3–6 | George Fraser | PTS | 32 (?) | Aug 25, 1906 | ||
| 12 | Draw | 4–3–5 | Jack Bruce | NWS | 4 | May 8, 1906 | ||
| 11 | Win | 4–3–4 | Ned Chernoff | NWS | 4 | Mar 26, 1906 | ||
| 10 | Draw | 3–3–4 | Mike Ward | NWS | 4 | Feb 27, 1906 | ||
| 9 | Win | 3–3–3 | Dick Given | NWS | 4 | Jan 25, 1906 | ||
| 8 | Draw | 2–3–3 | Frank Diamond | NWS | 6 | Jan 24, 1906 | ||
| 7 | Win | 2–3–2 | Jock Simcoe | NWS | 6 | Dec 14, 1905 | ||
| 6 | Loss | 1–3–2 | Elmer Morgan | KO | 4 (6) | Jul 27, 1905 | ||
| 5 | Win | 1–2–2 | Battling Simpson | NWS | 4 | Mar 27, 1905 | ||
| 4 | Draw | 0–2–2 | John Ulm | NWS | 4 | Mar 27, 1905 | ||
| 3 | Loss | 0–2–1 | Frank Diamond | NWS | 4 | Mar 4, 1905 | ||
| 2 | Loss | 0–1–1 | Frank Diamond | NWS | 4 | Feb 25, 1905 | ||
| 1 | Draw | 0–0–1 | Patsy Hogan | NWS | 4 | Feb 18, 1905 | ||
|-|-
Klaus was elected into the International Boxing Hall of Fame in 2008.