| Date: | August 6–15, 2021 |
| Edition: | 131st (men) / 119th (women) |
| Main Name: | Canadian Open (tennis) |
| Surface: | Hard / outdoor |
| Location: | Toronto, Ontario, Canada (men) Montreal, Canada (women) |
| Category: | ATP Tour Masters 1000 (men) WTA 1000 (women) |
| Champms: |  Daniil Medvedev |
| Champws: |  Camila Giorgi |
| Before Year: | 2019 |
| Before Name: | Rogers Cup |
The 2021 Canadian Open (branded as the 2021 National Bank Open presented by Rogers for sponsorship reasons) were outdoor hard court tennis tournaments played from August 6 to August 15, 2021, as part of the 2021 US Open Series. The men's event took place at the Aviva Centre in Toronto, and the women's tournament at the IGA Stadium in Montreal. It was the 131st edition of the men's tournament—a Masters 1000 tournament on the 2021 ATP Tour, and the 119th edition of the women's tournament—a WTA 1000 tournament on the 2021 WTA Tour.[1] [2]
They were originally scheduled to be played from August 8 to August 16, 2020, as part of the 2020 tennis season. Due to the COVID-19 pandemic, the 2020 edition of the Canadian Open was postponed to 2021 by Tennis Canada.
See also: Impact of the COVID-19 pandemic on sports, COVID-19 pandemic in Ontario and COVID-19 pandemic in Quebec. The men's and women's tournaments alternate between Toronto and Montreal annually. On April 11, 2020, pursuant to a request by the province of Quebec (the COVID-19 pandemic in Quebec was the centre of the first wave of the pandemic in Canada) for all cultural and sporting events to be cancelled through August,[3] Tennis Canada announced that the women's half of the Canadian Open, as part of the 2020 WTA Tour, would be postponed and held in Montreal in 2021.
The men's half of the event was still tentatively scheduled, but was still at risk of cancellation or postponement if the ATP and WTA extended their suspension of play into August, or if Toronto or the province of Ontario made a similar order that also applies to the period.[4] [5] Toronto had already cancelled all city-led major events, festivals, conferences, permits and cultural programs until June 30, 2020. Although subject to provincial restrictions on public gatherings, Mayor John Tory stated that these did not necessarily bar the hosting of sporting events.[6] [7]
On June 17, 2020, Tennis Canada officially announced that the men's tournament had also been postponed[8] to 2021, citing logistical and safety issues that would be present for players and staff even if the event were to be held behind closed doors, including a federal health order requiring 14 days self-isolation upon arrival for anyone travelling to Canada.[9] As they have been postponed, the men's and women's tournaments will still be held in Toronto and Montreal as per the traditional rotation.
On February 1, 2021, National Bank was promoted to title sponsor of the tournament, replacing Rogers Communications, which now serves as presenting sponsor.[10]
| Event | Round of 16 | Round of 32 | Round of 64 | width=85 | width=85 | width=85 | |||||||
| Men's singles[11] | 1000 | 600 | 360 | 180 | 90 | 45 | 10 | 25 | 16 | 0 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Men's doubles | 0 | ||||||||||||
| Women's singles[12] | 900 | 585 | 350 | 190 | 105 | 60 | 1 | 30 | 20 | 1 | |||
| Women's doubles | 5 |
| width=130 bgcolor=dfe2e9 | Event | width=80 bgcolor=lime | W | width=85 bgcolor=thistle | F | width=85 bgcolor=ffff00 | SF | width=85 bgcolor=ffebcd | QF | width=85 bgcolor=afeeee | Round of 16 | width=85 bgcolor=afeeee | Round of 32 | width=85 bgcolor=afeeee | Round of 64 | width=85 | Q2 | width=85 | Q1 |
| style=background:#ededed | Men's singles | $370,290 | $211,000 | $121,250 | $74,000 | $45,000 | $26,770 | $15,845 | $8,350 | $4,445 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| style=background:#ededed | Women's singles | $221,500 | $164,000 | $87,000 | $41,500 | $21,000 | $13,300 | $10,750 | $5,080 | $3,250 | |||||||||
| style=background:#ededed | Men's doubles* | $68,440 | $47,910 | $32,840 | $22,240 | $15,050 | $10,270 | ||||||||||||
| style=background:#ededed | Women's doubles* | $67,000 | $43,990 | $27,500 | $13,800 | $8,700 | $6,500 |
See main article: 2021 National Bank Open – Men's singles.
Daniil Medvedev def. 
Reilly Opelka, 6–4, 6–3.See main article: 2021 National Bank Open – Women's singles.
Camila Giorgi def. 
Karolína Plíšková, 6–3, 7–5.This was Giorgi's third WTA Tour singles title, and first at WTA 1000 level.
See main article: 2021 National Bank Open – Men's doubles.
Rajeev Ram / 
Joe Salisbury def. Nikola Mektić / Mate Pavić, 6–3, 4–6, [10–3]See main article: 2021 National Bank Open – Women's doubles.
Gabriela Dabrowski / 
Luisa Stefani def. Darija Jurak / Andreja Klepač, 6–3, 6–4The following are the seeded players. Rankings are as of August 2, 2021. Points before are as of August 9, 2021.
Because the tournament is being held one week later than the last edition in 2019 and as a result of special ranking adjustment rules due to COVID, the Points before column already reflects either a 50% reduction in the player's 2019 points or the substitution of the player's next best result.[13] Accordingly, the Points defending column has been adjusted to show the greater of (a) 50% of the player's 2019 points and (b) the player's 19th best result.
Following the tournament, players will count either their 2021 points or 50% of their 2019 points, whichever is greater.[14]
In addition, because the tournament is not mandatory in 2021, players may count their next best result instead if that result is better. Accordingly, points after will differ from points before only if the player's 2021 points won exceed points defending.
| Seed | Rank | Player | Points before | Points defending† | Points won | Points after | Status | |
|---|---|---|---|---|---|---|---|---|
| 1 | 2 | Daniil Medvedev | 9,920 | 300 | 1,000 | 10,620 | Champion, defeated Reilly Opelka | |
 | 7,815 | 500 | 0 | 7,815‡< | --Agreed that Nadal keeps 50% of 2019 result (= 500 points) due to COVID adjustments; however, those 500 points were already deducted in the August 9 rankings, i.e. in the points before column, so he doesn't lose another 500 points for August 16. The rankings page on the ATP website confirms that Nadal has 7,815 points for Aug. 16. This is all explained in the text above the table.--> | Withdrew due to left foot injury | ||
| 3 | 4 | 8,115 | (125) | 360 | 8,350 | |||
| 4 | 7 | Andrey Rublev | 6,005 | (180) | 90 | 6,005‡ | Third round lost to John Isner | |
| 5 | 10 | Denis Shapovalov | 3,625 | (45) | 10 | 3,625‡ | Second round lost to Frances Tiafoe [LL] | |
| 6 | 12 |  Casper Ruud | 3,205 | (35) | 180 | 3,350 | Quarterfinals lost to Stefanos Tsitsipas [3] | |
| 7 | 13 |  Hubert Hurkacz | 3,118 | (45) | 180 | 3,253 | Quarterfinals lost to Daniil Medvedev [1] | |
| 8 | 14 |  Diego Schwartzman | 2,913 | 23 | 90 | 2,980 | Third round lost to Roberto Bautista Agut [10] | |
| 9 | 15 | Félix Auger-Aliassime | 2,693 | 45 | 10 | 2,693‡< | --Confirmed August 16 points from ATP website--> | Second round lost to  Dušan Lajović |
| 10 | 16 | Roberto Bautista Agut | 2,630 | 90 | 180 | 2,720 | Quarterfinals lost to Reilly Opelka | |
| 11 | 17 |  Gaël Monfils | 2,423 | 180 | 180 | 2,423 | Quarterfinals lost to John Isner | |
| 12 | 18 |  Alex de Minaur | 2,600 | (45) | 10 | 2,600‡ | Second round lost to  Nikoloz Basilashvili | |
| 13 | 19 | Cristian Garín | 2,475 | (10) | 10 | 2,475 | Second round lost to John Isner | |
| 14 | 21 | Grigor Dimitrov | 2,466 | (10) | 10 | 2,466< | --Confirmed from ATP website--> | Second round lost to Reilly Opelka |
| 15 | 23 | Aslan Karatsev | 2,287 | (15) | 10 | 2,287 | Second round lost to Karen Khachanov | |
| 16 | 24 | Jannik Sinner | 2,745 | (40) | 10 | 2,745‡ | Second round lost to James Duckworth [Q] |
† Due to a change in schedule for the 2021 tournament and COVID ranking adjustment rules, the Points defending column reflects the greater of (a) 50% of the player's 2019 points and (b) the player's 19th best result. Instances of the latter are enclosed in parentheses.
‡ Because the 2021 tournament was non-mandatory, the player substituted his 19th best result instead of the points won in this tournament.
The following players received wild cards into the main singles draw:
The following player received entry using a protected ranking into the main singles draw:
The following player received entry using a special exempt into the main singles draw:
The following players received entry from the singles qualifying draw:
The following players received entry as lucky losers:
Matteo Berrettini → replaced by Jan-Lennard Struff Pablo Carreño Busta → replaced by Benoît Paire John Millman Novak Djokovic[15] → replaced by Dušan Lajović Miomir Kecmanović
David Goffin[15] → replaced by Albert Ramos Viñolas Rafael Nadal → replaced by Feliciano López
Dominic Thiem[15] → replaced by Taylor Fritz Milos Raonic[15] → replaced by Lloyd Harris Frances TiafoeThe following pairs received wildcards into the doubles main draw:
The following pair received entry as alternates:
Vasek Pospisil → replaced by Miomir Kecmanović / Casper Ruud Marcel Granollers / Horacio Zeballos → replaced by Oliver Marach / Philipp Oswald Austin Krajicek Filip Krajinović / Dušan Lajović → replaced by Aslan Karatsev / Dušan LajovićThe following players received wild cards into the main singles draw:
The following players received entry from the singles qualifying draw:
Amanda Anisimova Clara Burel Harriet Dart Océane Dodin Caroline Garcia Tereza Martincová Anastasia Potapova Alison Van Uytvanck Ekaterina Alexandrova → replaced by Kateřina Siniaková Ashleigh Barty[17] → replaced by Danielle Collins Jennifer Brady → replaced by Camila Giorgi Sofia Kenin[18] → replaced by Anastasija Sevastova Ajla Tomljanović Barbora Krejčiková → replaced by Marie Bouzková
Naomi Osaka[18] → replaced by Fiona Ferro Iga Świątek[18] → replaced by Liudmila Samsonova Markéta Vondroušová → replaced by 
Zhang Shuai Johanna Konta (left knee injury) Marie Bouzková (dizziness) Tereza Martincová (abdominal pain) Anastasia Potapova (left ankle injury) Zhang Shuai (left leg injury)The following pairs received wildcards into the doubles main draw:
The following pairs received entry as alternates:
Marie Bouzková / Lucie Hradecká → replaced by Elixane Lechemia / Ingrid Neel Alicja Rosolska Kaitlyn Christian / Nao Hibino → replaced by Kaitlyn Christian / Christina McHale
Anna Danilina / 
Lidziya Marozava → replaced by Ulrikke Eikeri / Catherine Harrison Eri Hozumi / Zhang Shuai → replaced by Océane Dodin / Kamilla Rakhimova Miyu Kato / Sabrina Santamaria → replaced by Emina Bektas / Tara Moore Barbora Krejčíková / Kateřina Siniaková → replaced by Beatrice Gumulya / Emily Webley-Smith Sofia Kenin / Jeļena Ostapenko → replaced by Jeļena Ostapenko / 
Dayana Yastremska Anastasia Potapova / Vera Zvonareva → replaced by Harriet Dart / 
Anett Kontaveit
Colombia
Romania
Slovakia
New Zealand
India
Tunisia