2025 Nottingham Open – Men's singles

Men's singles
2025 Nottingham Open
Champion	Marin Čilić
Runner-up	Shintaro Mochizuki
Score	6–2, 6–3

Jacob Fearnley was the defending champion^[1] but chose not to defend his title.

Marin Čilić won the title after defeating Shintaro Mochizuki 6–2, 6–3 in the final.^[2] At 36 years and eight months old, Čilić became the oldest grass court champion in Challenger history. Mochizuki was the first Japanese finalist at the tournament.^[3]

	Semifinals							Final
	LL	Colton Smith	2	2
	SE	Shintaro Mochizuki	6	6
								SE	Shintaro Mochizuki	2	3
								2	Marin Čilić	6	6
		Martín Landaluce	78	4	67
	2	Marin Čilić	66	6	79

	First round							Second round							Quarterfinals							Semifinals
	Q	J McCabe	6	77
	WC	G Loffhagen	3	64				Q	J McCabe	7	3	3
	SE	M Trungelliti	2	6	3			LL	C Smith	5	6	6
	LL	C Smith	6	4	6										LL	C Smith	65	6	6
	WC	J Pinnington Jones	3	712	3											E Nava	77	4	4
		E Nava	6	610	6				E Nava	77	6
	WC	R Peniston	5	6	6			WC	R Peniston	65	4
	5	DE Galán	7	4	2																	LL	C Smith	2	2
	3	B Holt	3	4																		SE	S Mochizuki	6	6
		J Faria	6	6					J Faria	7	6
	LL	E Spizzirri	7	4	4			Q	J Choinski	5	3
	Q	J Choinski	5	6	6											J Faria	2	0
		P-H Herbert	4	67											SE	S Mochizuki	6	6
	SE	S Mochizuki	6	79				SE	S Mochizuki	6	6
		M Krueger	1	5				8	T Boyer	2	3
	8	T Boyer	6	7

	First round							Second round							Quarterfinals							Semifinals
	7	A Cazaux	4	3
		A Mannarino	6	6					A Mannarino	6	5	5
		M Landaluce	6	2	6				M Landaluce	4	7	7
	NG	N Budkov Kjær	2	6	2											M Landaluce	63	6	6
		T Atmane	4	6	6											T Atmane	77	2	3
	Q	M Gigante	6	4	4				T Atmane	5	6	6
		F Fognini	3	65				Q	A Fery	7	3	4
	Q	A Fery	6	77																			M Landaluce	78	4	67
	6	T Barrios Vera	6	6																		2	M Čilić	66	6	79
	Q	J Trotter	3	4				6	T Barrios Vera	6	710
		T Schoolkate	6	6					T Schoolkate	2	68
		A Blockx	3	2											6	T Barrios Vera	1	3
	PR	L Harris	78	6											2	M Čilić	6	6
		V Royer	66	2				PR	L Harris	6	4	1r
	Q	H Grenier	3	2				2	M Čilić	2	6	3
	2	M Čilić	6	6

• Main draw
• Qualifying draw