Arthur Fils defeated Ugo Humbert in the final, 5–7, 7–6^(8–6), 6–3 to win the singles tennis title at the 2024 Japan Open.^[1] He saved a championship point en route to his third ATP Tour title (and first on hardcourt). Humbert was contending to become the first player in ATP Tour history to win his first seven finals.^[2]

Ben Shelton was the defending champion,^[3] but lost in the quarterfinals to Fils.^[4]

	Semifinals							Final
		Arthur Fils	710	712
	6	Holger Rune	68	610
									Arthur Fils	5	78	6
									Ugo Humbert	7	66	3
		Tomáš Macháč	3	6	2
		Ugo Humbert	6	3	6

	First round							Second round							Quarterfinals							Semifinals
	1	T Fritz	4	6	3
		A Fils	6	3	6				A Fils	65	0
	Q	B van de Zandschulp	3	4					M Berrettini	77	0r
		M Berrettini	6	6												A Fils	7	65	77
		M Navone	6	6											8	B Shelton	5	77	62
		L Darderi	4	4					M Navone	4	3
	PR	R Opelka	6	1	4			8	B Shelton	6	6
	8	B Shelton	3	6	6																		A Fils	710	712
	3	C Ruud	65	1																		6	H Rune	68	610
		J Thompson	77	6					J Thompson	2	3
	PR	M Čilić	4	6	3			WC	K Nishikori	6	6
	WC	K Nishikori	6	3	6										WC	K Nishikori	6	2	5
		F Auger-Aliassime	65	6	65										6	H Rune	3	6	7
	WC	Y Nishioka	77	3	77			WC	Y Nishioka	2	4
		A Tabilo	2	7	4			6	H Rune	6	6
	6	H Rune	6	5	6

	First round							Second round							Quarterfinals							Semifinals
	5	T Paul	6	6
		M Arnaldi	3	2				5	T Paul	6	3	64
		A Popyrin	3	77	5				T Macháč	2	6	77
		T Macháč	6	65	7											T Macháč	77	6
		TM Etcheverry	4	65											Q	A Michelsen	62	3
	Q	C O'Connell	6	77				Q	C O'Connell	1	4
	Q	A Michelsen	4	6	6			Q	A Michelsen	6	6
	4	S Tsitsipas	6	1	2																		T Macháč	3	6	2
	7	F Tiafoe	5	3																			U Humbert	6	3	6
	SE	B Nakashima	7	6				SE	B Nakashima	3	2
	WC	S Mochizuki	1	2					U Humbert	6	6
		U Humbert	6	6												U Humbert	7	2
		J Draper	6	6												J Draper	5	1r
	Q	M Bellucci	4	2					J Draper	6	6
		M Giron	4	77	4			2	H Hurkacz	4	4
	2	H Hurkacz	6	65	6

	First round							Qualifying competition
	1	Alex Michelsen	6	6
	WC	Yasutaka Uchiyama	3	4
								1	Alex Michelsen	6	6
									Borna Ćorić	3	3
		Borna Ćorić	6	6
	7	Damir Džumhur	3	4

	First round							Qualifying competition
	2	Botic van de Zandschulp	2	6	6
	WC	Yosuke Watanuki	6	3	1
								2	Botic van de Zandschulp	6	6
								8	Luca Nardi	2	3
	WC	Rei Sakamoto	3	1
	8	Luca Nardi	6	6

	First round							Qualifying competition
	3	Alexandre Müller	6	2	63
	Alt	Mattia Bellucci	4	6	77
								Alt	Mattia Bellucci	6	6
								6	Rinky Hijikata	3	1
		Aleksandar Vukic	62	77	63
	6	Rinky Hijikata	77	61	77

	First round							Qualifying competition
	4	Aleksandar Kovacevic	3	77	64
		Taro Daniel	6	64	77
									Taro Daniel	3	5
								5	Christopher O'Connell	6	7
	Alt	Otto Virtanen	4	4
	5	Christopher O'Connell	6	6

• Main draw
• Qualifying draw