Singles
2023 Japan Open Tennis Championships
Final
Champion	Ben Shelton
Runner-up	Aslan Karatsev
Score	7–5, 6–1
Details
Draw	32 (4Q / 3WC)
Seeds	8
Events
Singles Doubles
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Ben Shelton defeated Aslan Karatsev in the final, 7–5, 6–1 to win the singles tennis title at the 2023 Japan Open. It was his first ATP Tour title. He and his father Bryan Shelton became the fourth father-son duo in the Open Era to win tour-level singles titles.^[1]

Taylor Fritz was the defending champion,^[2] but lost in the second round to Shintaro Mochizuki.

	Semifinals							Final
	WC	Shintaro Mochizuki	3	4
		Aslan Karatsev	6	6
									Aslan Karatsev	5	1
									Ben Shelton	7	6
		Ben Shelton	62	77	6
	Q	Marcos Giron	77	65	4

	First round							Second round							Quarterfinals							Semifinals
	1	T Fritz	6	6
		C Norrie	4	3				1	T Fritz	6	4	62
	WC	S Mochizuki	6	77				WC	S Mochizuki	0	6	77
		TM Etcheverry	4	65											WC	S Mochizuki	7	2	7
	WC	S Shimabukuro	4	6	3											A Popyrin	5	6	5
	Q	C Garín	6	3	6			Q	C Garín	6	63	2
		A Popyrin	6	6					A Popyrin	4	77	6
	7	K Khachanov	4	2																		WC	S Mochizuki	3	4
	4	A de Minaur	4	77	77																		A Karatsev	6	6
	Q	J Draper	6	64	61			4	A de Minaur	6	7
		F Cerúndolo	4	1					D Schwartzman	0	5
		D Schwartzman	6	6											4	A de Minaur	3	2
		Z Zhang	3	6	77											A Karatsev	6	6
		H Hurkacz	6	4	64				Z Zhang	3	4
		A Karatsev	6	77					A Karatsev	6	6
	6	F Tiafoe	3	64

	First round							Second round							Quarterfinals							Semifinals
	5	T Paul	3	6	6
		D Altmaier	6	1	3			5	T Paul	6	6
		M McDonald	7	6					M McDonald	4	2
		M Purcell	5	4											5	T Paul	64	3
		B Shelton	3	6	77											B Shelton	77	6
	Q	T Daniel	6	4	62				B Shelton	65	6	6
		J Thompson	6	6					J Thompson	77	4	3
	3	A Zverev	3	4																			B Shelton	62	77	6
	8	F Auger-Aliassime	77	62	6																	Q	M Giron	77	65	4
		A Vukic	63	77	2			8	F Auger-Aliassime	6	6
		S Ofner	62	77	7				S Ofner	4	1
		C O'Connell	77	65	5										8	F Auger-Aliassime	1	4
		Y Nishioka	614	6	1										Q	M Giron	6	6
	Q	M Giron	716	4	6			Q	M Giron	6	6
	WC	Y Watanuki	66	3				2	C Ruud	3	4
	2	C Ruud	78	6

	First round							Qualifying competition
	1	Rinky Hijikata	6	7
	WC	Naoki Nakagawa	4	5
								1	Rinky Hijikata	7	3	2
								5	Cristian Garín	5	6	6
		Philip Sekulic	63	3
	5	Cristian Garín	77	6

	First round							Qualifying competition
	2	Marcos Giron	6	6
	WC	Kaichi Uchida	4	3
								2	Marcos Giron	6	6
									Yasutaka Uchiyama	3	2
		Yasutaka Uchiyama	78	4	6
	7	Brandon Nakashima	66	6	3

	First round							Qualifying competition
	3	Jack Draper	6	6
		Yuta Shimizu	4	4
								3	Jack Draper	6	6
								6	Jurij Rodionov	1	0
	WC	Hiroki Moriya	4	7	3
	6	Jurij Rodionov	6	5	6

	First round							Qualifying competition
	4	Taro Daniel	61	6	6
		Jason Jung	77	3	3
								4	Taro Daniel	7	6
									Rio Noguchi	5	4
		Rio Noguchi	5	6	6
	8	Wu Tung-lin	7	0	3

• Main draw
• Qualifying draw