| Yun Sung-hwan | |
| Position: | Starting pitcher |
| Team: | Samsung Lions |
| Number: | 1 |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 8 October 1981 |
| Birth Place: | Busan, South Korea |
| Debutleague: | KBO |
| Debutyear: | 2004 |
| Debutdate: | April 4 |
| Debutteam: | Samsung Lions |
| Statyear: | July 30, 2019 |
| Statleague: | KBO |
| Stat1label: | Win–loss record |
| Stat1value: | 133–97 |
| Stat2label: | Earned run average |
| Stat2value: | 4.18 |
| Stat3label: | Strikeouts |
| Stat3value: | 1,335 |
| Teams: |
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| Hangul: | 윤성환 |
| Hanja: | 尹盛桓 |
| Rr: | Yun Seong-hwan |
| Mr: | Yun Sŏng-hwan |
Yun Sung-hwan (; born October 8, 1981, in Busan, South Korea) is a starting pitcher for the Samsung Lions of the KBO League.[1] His nickname is Yun Taeja (Crown Prince Yun), for being the best pitcher that Sun Dong-yol has trained.
Upon graduation from Busan Commerce High School in, Yun started his collegiate career at Dong-eui University in Busan. He led his team to two consecutive gold medals in the baseball tournament at the Korean National Sports Festival in and, and helped his team to win their first national baseball championship as a starter and closer in .
Yun was selected by the Samsung Lions in the 2nd round (8th pick, 15th overall) of the KBO Draft. Yun wanted to join the Lotte Giants, the team from his hometown, however, head coach Sun Dong-yol, currently the manager of Samsung Lions saw great potential in Yun and scouted him.
On July 30,, Yun pitched the whole game for the first time in his pro career against the LG Twins. He won against all 7 teams on August 5 and became the ace of the Samsung Lions.
Yun ranked first among KBO pitchers in total victories with 14 wins in 2009.
After the 2014 season, he broke the record for the best FA contract ever with a four-year, eight billion won contract (4.8 billion won, annual salary 800 million won).[2]