2021 San Diego Open – Singles

This was the first edition of the tournament, which was primarily organized to compensate for the cancellation of Asian tournaments in 2021 due to the COVID-19 pandemic.^[1]

Singles
2021 San Diego Open
Champion	Casper Ruud
Runner-up	Cameron Norrie
Score	6–0, 6–2
Draw	28 (4 Q / 2 WC )
Seeds	8

Main article: 2021 San Diego Open

Casper Ruud won the title, defeating Cameron Norrie in the final, 6–0, 6–2.^[2] It was Ruud's fifth victory of the season.

Seeds

The top four seeds received a bye into the second round.

1. Andrey Rublev (semifinals)
2. Casper Ruud (champion)
3. Félix Auger-Aliassime (withdrew)
4. Denis Shapovalov (quarterfinals)
5. Hubert Hurkacz (second round)
6. Diego Schwartzman (quarterfinals)
7. Cristian Garín (withdrew)
8. Dan Evans (second round)
9. Lorenzo Sonego (quarterfinals)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• ITF = ITF entry
• PR = Protected ranking
• SR = Special ranking
• SE = Special exempt
• JE = Junior exempt
• JR = Junior Accelerator Programme entrant
• CO = College Accelerator Programme entrant
• NG = Next Gen Accelerator Program entrant
• w/o = Walkover
• r = Retired
• d = Defaulted

Finals

	Semifinals							Final
	1	Andrey Rublev	6	3	4
		Cameron Norrie	3	6	6
									Cameron Norrie	0	2
								2	Casper Ruud	6	6
		Grigor Dimitrov	4	6	4
	2	Casper Ruud	6	4	6

Top half

	First round							Second round							Quarterfinals							Semifinals
								1	A Rublev	6	6
		F Fognini	77	1	5			WC	B Nakashima	2	1
	WC	B Nakashima	65	6	7										1	A Rublev	6	7
		L Harris	3	6	6										6	D Schwartzman	1	5
	Q	C Eubanks	6	1	4				L Harris	6	3	2
	Q	F Gaio	2	3				6	D Schwartzman	4	6	6
	6	D Schwartzman	6	6																		1	A Rublev	6	3	4
																							C Norrie	3	6	6
								4	D Shapovalov	79	6
	Q	S Caruso	4	62					T Fritz	67	2
		T Fritz	6	77											4	D Shapovalov	3	1
		D Koepfer	2	5												C Norrie	6	6
		C Norrie	6	7					C Norrie	77	6
	LL	K Anderson	611	5				8	D Evans	63	3
	8	D Evans	713	7

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	H Hurkacz	77	6
	Q	A Bolt	62	1				5	H Hurkacz	7	4	2
		A Karatsev	6	7					A Karatsev	5	6	6
		F Delbonis	1	5												A Karatsev	1	6	2
		M Fucsovics	3	6	5											G Dimitrov	6	1	6
		G Dimitrov	6	1	7				G Dimitrov	6	6
								LL	A Holmgren	1	1
																							G Dimitrov	4	6	4
	9	L Sonego	6	6																		2	C Ruud	6	4	6
		N Basilashvili	3	4				9	L Sonego	6	6
		S Korda	6	5	6				S Korda	4	3
		T Paul	3	7	1										9	L Sonego	1	4
	LL	D Kudla	3	2											2	C Ruud	6	6
	WC	A Murray	6	6				WC	A Murray	5	4
								2	C Ruud	7	6

Qualifying

Seeds

1. Dominik Koepfer (moved to main draw)
2. Kevin Anderson (qualifying competition, lucky loser)
3. Jordan Thompson (first round)
4. Steve Johnson (first round)
5. Denis Kudla (qualifying competition, lucky loser)
6. Salvatore Caruso (qualified)
7. Alex Bolt (qualified)
8. Mitchell Krueger (first round)

Qualifiers

1. Christopher Eubanks
2. Alex Bolt
3. Salvatore Caruso
4. Federico Gaio

Lucky losers

1. Kevin Anderson
2. Denis Kudla
3. August Holmgren

Qualifying draw

First qualifier

	First round							Qualifying competition
	Alt	Lucas Gómez	2	6	1
		Darian King	6	3	6
									Darian King	61	5
									Christopher Eubanks	77	7
		Christopher Eubanks	6	3	6
	8	Mitchell Krueger	1	6	3

Second qualifier

	First round							Qualifying competition
	2	Kevin Anderson	6	7
		Jason Kubler	3	5
								2	Kevin Anderson	77	3	5
								7	Alex Bolt	65	6	7
	WC	Alafia Ayeni	4	65
	7	Alex Bolt	6	77

Third qualifier

	First round							Qualifying competition
	3	Jordan Thompson	4	66
	Alt	August Holmgren	6	78
								Alt	August Holmgren	6	3	67
								6	Salvatore Caruso	4	6	79
		Ernesto Escobedo	5	6	4
	6	Salvatore Caruso	7	1	6

Fourth qualifier

	First round							Qualifying competition
	4	Steve Johnson	6	64	3
		Federico Gaio	3	77	6
									Federico Gaio	6	6
								5	Denis Kudla	4	2
	WC	Zachary Svajda	6	2	4
	5	Denis Kudla	3	6	6