2025 San Diego Open – Singles

This was the first edition of the tournament as an ATP Challenger Tour event.^[1]

Singles
2025 San Diego Open
Champion	Eliot Spizzirri
Runner-up	Mackenzie McDonald
Score	6–4, 2–6, 6–4

Main article: 2025 San Diego Open

Eliot Spizzirri won the title after defeating Mackenzie McDonald 6–4, 2–6, 6–4 in the final.^[2]

Seeds

1. Arthur Cazaux (quarterfinals)
2. Tristan Boyer (first round)
3. Dominik Koepfer (withdrew)
4. Mackenzie McDonald (final)
5. Kamil Majchrzak (semifinals)
6. Taro Daniel (quarterfinals)
7. Mitchell Krueger (second round)
8. Ethan Quinn (semifinals)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• SE = Special exempt
• PR = Protected ranking
• ITF = ITF entry
• JE = Junior exempt
• w/o = Walkover
• r = Retired
• d = Defaulted
• SR = Special ranking

Finals

	Semifinals							Final
	8	Ethan Quinn	3	6	3
		Eliot Spizzirri	6	4	6
									Eliot Spizzirri	6	2	6
								4	Mackenzie McDonald	4	6	4
	4	Mackenzie McDonald	3	6	6
	5	Kamil Majchrzak	6	1	1

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	A Cazaux	6	6
		L Tu	3	4				1	A Cazaux	7	6
		C Lestienne	6	6					C Lestienne	5	4
	LL	Stefan Dostanic	3	4											1	A Cazaux	5	77	4
	WC	J Brooksby	6	6											8	E Quinn	7	61	6
		C Wong	2	4				WC	J Brooksby	3	7	65
	Q	A Perez	4	63				8	E Quinn	6	5	77
	8	E Quinn	6	77																		8	E Quinn	3	6	3
	Q	A Martin	6	3	6																		E Spizzirri	6	4	6
		Z Svajda	4	6	3			Q	A Martin	6	1	4
	Q	A Hernández	3	1					E Spizzirri	1	6	6
		E Spizzirri	6	6												E Spizzirri	62	6	6
	Q	A Rybakov	77	6											6	T Daniel	77	0	4
		R Albot	62	3				Q	A Rybakov	69	61
		T Zink	4	4				6	T Daniel	711	77
	6	T Daniel	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	7	M Krueger	6	3	6
		A Andrade	4	6	1			7	M Krueger	3	3
		J Pinnington Jones	3	64				WC	T Svajda	6	6
	WC	T Svajda	6	77											WC	T Svajda	3	4
		M Gigante	6	6											4	M McDonald	6	6
	Q	Rohan Murali	2	4					M Gigante	3	5
		Karue Sell	3	3				4	M McDonald	6	7
	4	M McDonald	6	6																		4	M McDonald	3	6	6
	5	K Majchrzak	77	6																		5	K Majchrzak	6	1	1
		C Smith	63	4				5	K Majchrzak	7	7
	Q	B Bicknell	6	64	4				M Mmoh	5	5
		M Mmoh	2	77	6										5	K Majchrzak	77	1
		T Atmane	65	6	5											A Bolt	62	1r
	Alt	G Nanda	77	4	7			Alt	G Nanda	4	3
		A Bolt	6	77					A Bolt	6	6
	2/WC	T Boyer	3	64