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

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]

Casper Ruud won the title, defeating Cameron Norrie in the final, 6–0, 6–2.

Seeds

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

Draw

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

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

References

External links

• Main draw
• Qualifying draw