| Singles | |
|---|---|
| 2023 Nonthaburi Challenger III | |
| Champion |  Sho Shimabukuro |
| Runner-up |  Arthur Cazaux |
| Final score | 6–2, 7–5 |
Arthur Cazaux was the defending champion [1] but lost in the final to Sho Shimabukuro.
Shimabukuro won the title after defeating Cazaux 6–2, 7–5 in the final.
James Duckworth (second round)
Alexander Ritschard (first round) Antoine Escoffier (quarterfinals, retired) Evan Furness (first round)
Paul Jubb (first round)
Nicholas David Ionel (first round)
Peter Gojowczyk (withdrew)
Zdeněk Kolář (quarterfinals)| Semifinals | Final | ||||||||||||
| Sho Shimabukuro | 6 | 7 | |||||||||||
 Hong Seong-chan | 2 | 5 | |||||||||||
| Sho Shimabukuro | 6 | 7 | |||||||||||
| Q | Arthur Cazaux | 2 | 5 | ||||||||||
| LL |  Giovanni Fonio | 5 | 3 | ||||||||||
| Q | Arthur Cazaux | 7 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | J Duckworth | 6 | 6 | ||||||||||||||||||||||||
| Alt |  B Zhukayev | 3 | 4 | 1 | J Duckworth | 64 | 6 | 1 | |||||||||||||||||||
| S Shimabukuro | 6 | 6 | S Shimabukuro | 77 | 4 | 6 | |||||||||||||||||||||
| M Moraing | 3 | 2 | S Shimabukuro | 6 | 67 | 6 | |||||||||||||||||||||
| J Choinski | 6 | 6 | 8 | Z Kolář | 0 | 79 | 2 | ||||||||||||||||||||
| WC |  J Navasirisomboon | 1 | 3 | J Choinski | 4 | 6 | 0 | ||||||||||||||||||||
| Q |  E Donskoy | 6 | 67 | 2 | 8 | Z Kolář | 6 | 3 | 6 | ||||||||||||||||||
| 8 | Z Kolář | 3 | 79 | 6 | S Shimabukuro | 6 | 7 | ||||||||||||||||||||
| 4 | E Furness | 1 | 1 | S-c Hong | 2 | 5 | |||||||||||||||||||||
 K Żuk | 6 | 6 | K Żuk | 3 | 4 | ||||||||||||||||||||||
| WC | Y Charoenphon | 3 | 1 |  M Geerts | 6 | 6 | |||||||||||||||||||||
| M Geerts | 6 | 6 | M Geerts | 1 | 5 | ||||||||||||||||||||||
| S-c Hong | 6 | 6 | S-c Hong | 6 | 7 | ||||||||||||||||||||||
| WC | K Samrej | 4 | 4 | S-c Hong | 6 | 77 | |||||||||||||||||||||
 NH Lý | 6 | 77 | NH Lý | 2 | 63 | ||||||||||||||||||||||
| 6 | ND Ionel | 1 | 65 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| LL | G Fonio | 6 | 7 | ||||||||||||||||||||||||
| D Yevseyev | 2 | 5 | LL | G Fonio | 64 | 6 | 6 | ||||||||||||||||||||
| H Moriya | 0 | 4 |  B Hassan | 77 | 4 | 2 | |||||||||||||||||||||
| B Hassan | 6 | 6 | LL | G Fonio | 7 | 65 | 2 | ||||||||||||||||||||
| D Michalski | 6 | 6 | 3 | A Escoffier | 5 | 77 | 1r | ||||||||||||||||||||
| Q | Dominik Palán | 4 | 2 | D Michalski | 3 | 6 | 1 | ||||||||||||||||||||
| Alt | S Travaglia | 1 | 64 | 3 | A Escoffier | 6 | 4 | 6 | |||||||||||||||||||
| 3 | Antoine Escoffier | 6 | 77 | LL | G Fonio | 5 | 3 | ||||||||||||||||||||
| 5 | P Jubb | 6 | 4 | 5 | Q | A Cazaux | 7 | 6 | |||||||||||||||||||
| Q | S Mochizuki | 2 | 6 | 7 | Q | S Mochizuki | 3 | 1 | |||||||||||||||||||
| D Added | 6 | 4 | 1 |  T Sandgren | 6 | 6 | |||||||||||||||||||||
| T Sandgren | 1 | 6 | 6 | T Sandgren | 64 | 4 | |||||||||||||||||||||
| Q | A Cazaux | 77 | 6 | Q | A Cazaux | 77 | 6 | ||||||||||||||||||||
| Q | S Parker | 61 | 4 | Q | A Cazaux | 6 | 6 | ||||||||||||||||||||
| Q | J Menšík | 77 | 7 | Q | J Menšík | 3 | 0 | ||||||||||||||||||||
| 2 | A Ritschard | 65 | 5 | ||||||||||||||||||||||||
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