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| 2021 San Diego Open | |
|---|---|
| Date | September 27–October 3 |
| Edition | 35th (1st as ATP 250 event) |
| Category | ATP Tour 250 |
| Draw | 28S / 16D |
| Prize money | $600,000 |
| Surface | Hard / outdoor |
| Location | San Diego, United States |
| Venue | Barnes Tennis Center |
| Champions | |
| Singles | |
 Casper Ruud | |
| Doubles | |
 Joe Salisbury /Neal Skupski | |
The2021 San Diego Open was a men'stennis tournament played on outdoorhard courts. It was the 1st edition of theSan Diego Open, and part of theATP Tour 250 series of the2021 ATP Tour. It was held at theBarnes Tennis Center inSan Diego, United States, from September 27 until October 3, 2021.It was primarily organized due to the cancellation of Asian tournaments during the 2021 season, because of the ongoingCOVID-19 pandemic.
Positioned one week before the 1000Indian Wells Masters and only a 2-hour 30 min drive fromIndian Wells, theSan Diego Open attracted a very strong line up of players includingDenis Shapovalov,Andrey Rublev,Grigor Dimitrov andAndy Murray.[1] With 8 of the top 20 players attending and the ranking cut off being 42 to get into the main draw it was the second most competitive ATP 250 all season sinceDoha.
Daniel Vallverdu took on the position of managing director,[2] Ryan Redondo[3] was named the tournament director andBillie Jean King[4] accepted the role of honorary tournament chair.
Casper Ruud defeatedCameron Norrie, 6–0, 6–2
Joe Salisbury /Neal Skupski defeated
John Peers /
Filip Polášek, 7–6(7–2), 3–6, [10–5]
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 RUS | Andrey Rublev | 5 | 1 |
| NOR | Casper Ruud | 10 | 2 |
 CAN | |||
| CAN | Denis Shapovalov | 12 | 4 |
 POL | Hubert Hurkacz | 13 | 5 |
 ARG | Diego Schwartzman | 15 | 6 |
 CHI | |||
| GBR | Dan Evans | 23 | 8 |
 ITA | Lorenzo Sonego | 24 | 9 |
The following players receivedwildcards into the main draw:
The following player received entry as a special exempt:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
Félix Auger-Aliassime → replaced by
August HolmgrenCristian Garín → replaced by
Dominik Koepfer
David Goffin → replaced by
Sebastian Korda
Kwon Soon-woo → replaced by
Kevin Anderson
Dušan Lajović → replaced byLloyd Harris
Kei Nishikori → replaced byDenis KudlaReilly Opelka → replaced byFederico Delbonis| Country | Player | Country | Player | Rank1 | Seed |
|---|---|---|---|---|---|
| GBR | Joe Salisbury | GBR | Neal Skupski | 25 | 1 |
| GBR | Jamie Murray |  BRA | Bruno Soares | 29 | 2 |
| AUS | John Peers | SVK | Filip Polášek | 33 | 3 |
| ITA | Simone Bolelli | ARG | Máximo González | 57 | 4 |
The following pairs received wildcards into the doubles main draw:
Nicholas Monroe /Frances Tiafoe → replaced byDominik Koepfer /Nicholas MonroeRajeev Ram /Jack Sock → replaced byJordan Thompson /Jackson Withrow
