2022 Keio Challenger – Men's singles

Kwon Soon-woo was the defending champion^[1] but chose not to defend his title.

Men's singles
2022 Keio Challenger
Champion	Christopher O'Connell
Runner-up	Yosuke Watanuki
Score	6–1, 6–7(5–7), 6–3

Main article: 2022 Keio Challenger

Christopher O'Connell won the title after defeating Yosuke Watanuki 6–1, 6–7^(5–7), 6–3 in the final.

Seeds

1. Christopher O'Connell (champion)
2. John Millman (quarterfinals, withdrew)
3. Kaichi Uchida (quarterfinals)
4. Damir Džumhur (quarterfinals)
5. Wu Tung-lin (quarterfinals)
6. Hiroki Moriya (first round)
7. Yosuke Watanuki (final)
8. Zdeněk Kolář (first round)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• ITF = ITF entry
• PR = Protected ranking
• SR = Special ranking
• SE = Special exempt
• JE = Junior exempt
• JR = Junior Accelerator Programme entrant
• CO = College Accelerator Programme entrant
• NG = Next Gen Accelerator Program entrant
• w/o = Walkover
• r = Retired
• d = Defaulted

Finals

	Semifinals							Final
	1	Christopher O'Connell	6	6
		Sho Shimabukuro	3	3
								1	Christopher O'Connell	6	65	6
								7	Yosuke Watanuki	1	77	3
	7	Yosuke Watanuki	7	77
		Nino Serdarušić	5	65

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	C O'Connell	6	77
		R Ramanathan	4	63				1	C O'Connell	6	6
	WC	S Hazawa	4	2					E Kırkın	3	4
		E Kırkın	6	6											1	C O'Connell	65	77	6
	WC	Tomoya Fujiwara	78	1	4										5	T-l Wu	77	64	4
	LL	Rimpei Kawakami	66	6	6			LL	R Kawakami	2	4
	PR	Y Sugita	3	3				5	T-l Wu	6	6
	5	T-l Wu	6	6																		1	C O'Connell	6	6
	4	D Džumhur	6	6																			S Shimabukuro	3	3
	Q	Ryota Tanuma	3	1				4	D Džumhur	5	6	6
	Q	J Trotter	6	6				Q	J Trotter	7	4	4
	Q	J Mridha	4	1											4	D Džumhur	4	1
		S Shimabukuro	6	6												S Shimabukuro	6	6
	Q	Yuki Mochizuki	2	4					S Shimabukuro	6	6
		J Jung	6	6					J Jung	4	3
	8	Z Kolář	2	1

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	7	Yo Watanuki	6	6
		N Nakagawa	4	4				7	Yo Watanuki	5	6	2
		NH Lý	6	4	0			PR	T Ito	7	0	1r
	PR	T Ito	4	6	6										7	Yo Watanuki	7	4	6
	WC	M Imamura	3	4											3	K Uchida	5	6	3
		Y-s Chung	6	6					Y-s Chung	64	3
	Q	S-c Hong	6	5	3			3	K Uchida	77	6
	3	K Uchida	3	7	6																	7	Yo Watanuki	7	77
	6	H Moriya	67	6	4																		N Serdarušić	5	65
		FC Jianu	79	0	6				FC Jianu	4	6	5
		S Mochizuki	3	77	1				N Serdarušić	6	4	7
		N Serdarušić	6	65	6											N Serdarušić	w/o
		ND Ionel	5	2											2	J Millman
		F Ferreira Silva	7	6					F Ferreira Silva	3	2
	Q	T Ichikawa	3	65				2	J Millman	6	6
	2	J Millman	6	77