| Singles | |
|---|---|
| 2023 Nonthaburi Challenger II | |
| Champion |  Arthur Cazaux |
| Runner-up |  Lloyd Harris |
| Score | 7–6(7–5), 6–2 |
Dennis Novak was the defending champion [1] but lost in the semifinals to Arthur Cazaux.
Cazaux won the title after defeating Lloyd Harris 7–6(7–5), 6–2 in the final.
Dennis Novak (semifinals) Lloyd Harris (final)
Kacper Żuk (first round)
Zdeněk Kolář (first round)
Michael Geerts (second round) Daniel Michalski (quarterfinals)
Sho Shimabukuro (first round)
Tennys Sandgren (quarterfinals)| 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 | ||||||||||
| 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 | |||||||||||||||||||||||
| 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 | ||||||||||||||||||||||||
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