2023 Nonthaburi Challenger II – Singles

Dennis Novak was the defending champion^[1] but lost in the semifinals to Arthur Cazaux.

Singles
2023 Nonthaburi Challenger II
Champion	Arthur Cazaux
Runner-up	Lloyd Harris
Score	7–6(7–5), 6–2

Main article: 2023 Nonthaburi Challenger II

Cazaux won the title after defeating Lloyd Harris 7–6^(7–5), 6–2 in the final.

Seeds

1. Dennis Novak (semifinals)
2. Lloyd Harris (final)
3. Kacper Żuk (first round)
4. Zdeněk Kolář (first round)
5. Michael Geerts (second round)
6. Daniel Michalski (quarterfinals)
7. Sho Shimabukuro (first round)
8. Tennys Sandgren (quarterfinals)

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	Dennis Novak	4	6	2
	Q	Arthur Cazaux	6	4	6
								Q	Arthur Cazaux	77	6
								2	Lloyd Harris	65	2
	Q	Jason Jung	1	4
	2	Lloyd Harris	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	D Novak	6	79
	Q	H Squire	3	67				1	D Novak	6	6
		V Royer	6	0					V Royer	2	3
	Alt	B Harris	1	0r											1	D Novak	6	6
		M Gengel	6	6												M Gengel	3	3
		H Moriya	1	2					M Gengel	2	77	7
	WC	P Kovapitukted	1	3				5	M Geerts	6	60	5
	5	M Geerts	6	6																		1	D Novak	4	6	2
	4	Z Kolář	3	3																		Q	A Cazaux	6	4	6
	Alt	P Gunneswaran	6	6				Alt	P Gunneswaran	77	64	3
	Q	G Fonio	4	4				Q	A Cazaux	65	77	6
	Q	A Cazaux	6	6											Q	A Cazaux	6	6
		B Hassan	7	7											8	T Sandgren	3	3
	Q	Alafia Ayeni	5	5					B Hassan	3	6	66
		D Added	6	62	4			8	T Sandgren	6	1	78
	8	T Sandgren	2	77	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	7	S Shimabukuro	4	1
	Q	J Jung	6	6				Q	J Jung	6	77
		B Zhukayev	77	77					B Zhukayev	4	63
	WC	W Trongcharoenchaikul	62	65											Q	J Jung	4	7	6
		D Yevseyev	4	61											Q	E Donskoy	6	5	3
	Q	E Donskoy	6	77				Q	E Donskoy	6	77
		Y Uchiyama	6	6					Y Uchiyama	4	63
	3	K Żuk	2	1																		Q	J Jung	1	4
	6	D Michalski	3	7	6																	2	L Harris	6	6
		S Mochizuki	6	5	3			6	D Michalski	77	710
		S Travaglia	65	7	6				S Travaglia	64	68
		A Arnaboldi	77	5	3										6	D Michalski	4	3
		M Sasikumar	4	4											2	L Harris	6	6
		M Moraing	6	6					M Moraing	1	3
	WC	K Samrej	1	2				2	L Harris	6	6
	2	L Harris	6	6