Singles
2025 ATP Hong Kong Tennis Open
Final
Champion	Alexandre Müller
Runner-up	Kei Nishikori
Score	2–6, 6–1, 6–3
Details
Draw	28 (4 Q / 3 WC )
Seeds	8
Events
Singles Doubles
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Alexandre Müller defeated Kei Nishikori in the final, 2–6, 6–1, 6–3 to win the singles tennis title at the 2025 ATP Hong Kong Tennis Open.^[1] It was his first ATP Tour singles title. Müller became the second player to win an ATP Tour title after losing the first set in all of his matches, after Alexander Bublik at the 2024 Open Sud de France.

It was Nishikori's first ATP Tour final since the 2019 Brisbane International.

Andrey Rublev was the defending champion,^[2] but lost in the second round to Fábián Marozsán.

The top four seeds will receive a bye into the second round.

	Semifinals							Final
		Shang Juncheng	3r
	WC	Kei Nishikori	4
								WC	Kei Nishikori	6	1	3
									Alexandre Müller	2	6	6
		Alexandre Müller	4	77	6
		Jaume Munar	6	65	4

	First round							Second round							Quarterfinals							Semifinals
								1	A Rublev	5	6	3
		R Safiullin	1	69					F Marozsán	7	3	6
		F Marozsán	6	711												F Marozsán	6	3	4
		J Shang	77	6												J Shang	1	6	6
	WC	C Wong	63	4					J Shang	6	6
	Q	F Passaro	4	4				7	P Martínez	3	1
	7	P Martínez	6	6																			J Shang	3r
																						WC	K Nishikori	4
								3	K Khachanov	6	3	5
		D Shapovalov	2	3				WC	K Nishikori	4	6	7
	WC	K Nishikori	6	6											WC	K Nishikori	6	3	6
		C Norrie	6	7												C Norrie	3	6	2
		L Tien	3	5					C Norrie	6	4	6
		L Sonego	77	6					L Sonego	2	6	1
	6	B Nakashima	64	3

	First round							Second round							Quarterfinals							Semifinals
	8	L Darderi	3	3
		M Kecmanović	6	6					M Kecmanović	7	66	610
		A Müller	2	6	6				A Müller	5	78	712
	Q	M-A Hüsler	6	4	3											A Müller	3	6	6
	WC	Z Bergs	6	6											4	A Fils	6	3	1
	Q	A Moro Cañas	4	4				WC	Z Bergs	67	4
								4	A Fils	79	6
																							A Müller	4	77	6
	5	N Borges	3	6	78																		J Munar	6	65	4
		Y Bu	6	3	66			5	N Borges	3	5
		J Munar	4	6	6				J Munar	6	7
		A Davidovich Fokina	6	3	3											J Munar	2	77	7
	Q	G Diallo	4	77	7										2	L Musetti	6	64	5
		R Carballés Baena	6	64	5			Q	G Diallo	4	3
								2	L Musetti	6	6

1. Marc-Andrea Hüsler
2. Gabriel Diallo
3. Alejandro Moro Cañas
4. Francesco Passaro

	First round							Qualifying competition
	1	Pavel Kotov	3	7	77
		Valentin Royer	6	5	65
								1	Pavel Kotov	67	4
									Marc-Andrea Hüsler	79	6
		Marc-Andrea Hüsler	7	6
	5	Laslo Djere	5	4

	First round							Qualifying competition
	2	Gabriel Diallo	77	6
	WC	Ng Ki-lung	62	2
								2	Gabriel Diallo	4	6	7
								8	Hugo Grenier	6	1	5
		Térence Atmane	6	3	4
	8	Hugo Grenier	3	6	6

	First round							Qualifying competition
	3	Daniel Altmaier	4	3
		Alejandro Moro Cañas	6	6
									Alejandro Moro Cañas	6	6
								WC	Cui Jie	2	3
	WC	Cui Jie	6	6
	6	Juan Manuel Cerúndolo	2	4

	First round							Qualifying competition
	4	Francesco Passaro	7	4	6
		Aziz Dougaz	5	6	3
								4	Francesco Passaro	4	6	6
									Denis Yevseyev	6	2	4
		Denis Yevseyev	6	2	6
	7	Cristian Garín	4	6	2

• Main draw
• Qualifying draw