| Singles | |
|---|---|
| 2023 Nonthaburi Challenger | |
| Champion |  Dennis Novak |
| Runner-up |  Wu Tung-lin |
| Final score | 6–4, 6–4 |
Stuart Parker was the defending champion [1] but lost in the qualifying competition to Giovanni Fonio.
Dennis Novak won the title after defeating Wu Tung-lin 6–4, 6–4 in the final.
Fábián Marozsán (second round) Dennis Novak (champion) Wu Tung-lin (final)
Antoine Escoffier (semifinals)
Gianluca Mager (first round)
Paul Jubb (first round)
Max Purcell (quarterfinals) Hsu Yu-hsiou (quarterfinals)| Semifinals | Final | ||||||||||||
 Lloyd Harris | 4 | 5 | |||||||||||
| 3 | Wu Tung-lin | 6 | 7 | ||||||||||
| 3 | Wu Tung-lin | 4 | 4 | ||||||||||
| 2 | Dennis Novak | 6 | 6 | ||||||||||
| 4 | Antoine Escoffier | 3 | 2 | ||||||||||
| 2 | Dennis Novak | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | F Marozsán | 6 | 6 | ||||||||||||||||||||||||
| WC |  P Kovapitukted | 3 | 3 | 1 | F Marozsán | 6 | 0 | 3 | |||||||||||||||||||
 B Hassan | 2 | 5 | L Harris | 3 | 6 | 6 | |||||||||||||||||||||
| L Harris | 6 | 7 | L Harris | 67 | 6 | 6 | |||||||||||||||||||||
 M Trungelliti | 5 | 2 | 8 | Y-h Hsu | 79 | 3 | 4 | ||||||||||||||||||||
| Q | D Kelly | 7 | 6 | Q | D Kelly | 2 | 2 | ||||||||||||||||||||
 H Moriya | 3 | 2 | 8 | Y-h Hsu | 6 | 6 | |||||||||||||||||||||
| 8 | Y-h Hsu | 6 | 6 | L Harris | 4 | 5 | |||||||||||||||||||||
| 3 | T-l Wu | 6 | 6 | 3 | T-l Wu | 6 | 7 | ||||||||||||||||||||
| WC | T Suksumrarn | 4 | 1 | 3 | T-l Wu | 64 | 7 | 6 | |||||||||||||||||||
| Y Uchiyama | 6 | 6 | Y Uchiyama | 77 | 5 | 4 | |||||||||||||||||||||
| WC | Maximus Jones | 4 | 4 | 3 | T-l Wu | 7 | 3 | 6 | |||||||||||||||||||
| Valentin Royer | 4 | 6 | 2 | Q |  E Donskoy | 5 | 6 | 3 | |||||||||||||||||||
| Q |  Alafia Ayeni | 6 | 3 | 6 | Q | A Ayeni | 4 | 4 | |||||||||||||||||||
| Q | E Donskoy | 6 | 77 | Q | E Donskoy | 6 | 6 | ||||||||||||||||||||
| 6 | P Jubb | 1 | 65 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | M Purcell | 6 | 6 | ||||||||||||||||||||||||
| S Travaglia | 2 | 4 | 7 | M Purcell | 77 | 6 | |||||||||||||||||||||
 M Moraing | 7 | 65 | 6 | M Moraing | 65 | 4 | |||||||||||||||||||||
| Q | L Pouille | 5 | 77 | 3 | 7 | M Purcell | 2 | 68 | |||||||||||||||||||
| S Shimabukuro | 6 | 3 | 6 | 4 | A Escoffier | 6 | 710 | ||||||||||||||||||||
 B Zhukayev | 4 | 6 | 4 | S Shimabukuro | 6 | 66 | 3 | ||||||||||||||||||||
| S Mochizuki | 4 | 77 | 2 | 4 | A Escoffier | 2 | 78 | 6 | |||||||||||||||||||
| 4 | Antoine Escoffier | 6 | 65 | 6 | 4 | A Escoffier | 3 | 2 | |||||||||||||||||||
| 5 | G Mager | 3 | 78 | 3 | 2 | D Novak | 6 | 6 | |||||||||||||||||||
| Q | H Squire | 6 | 66 | 6 | Q | H Squire | 4 | 3 | |||||||||||||||||||
 M Gengel | 6 | 64 | 6 | M Gengel | 6 | 6 | |||||||||||||||||||||
| T Sandgren | 4 | 77 | 1 | M Gengel | 3 | 77 | 3 | ||||||||||||||||||||
| Q | G Fonio | 5 | 77 | 79 | 2 | D Novak | 6 | 65 | 6 | ||||||||||||||||||
| TA Tirante | 7 | 63 | 67 | Q | G Fonio | 2 | 1 | ||||||||||||||||||||
| D Added | 2 | 2 | 2 | D Novak | 6 | 6 | |||||||||||||||||||||
| 2 | D Novak | 6 | 6 | ||||||||||||||||||||||||
Omar Jasika was the defending champion, but he chose not to participate. Taylor Harry Fritz won the title, defeating Tommy Paul in the final, 6–2, 6–7(4–7), 6–2.
Zhang Ze was the defending champion but lost in the third round to Bai Yan.
Radu Albot was the defending champion but chose not to defend his title.
Tatsuma Ito was the defending champion but retired in the second round to Tseng Chun-hsin.
Lloyd Harris was the defending champion but chose not to defend his title.
Stefanos Tsitsipas was the defending champion and successfully defended his title, defeating Félix Auger-Aliassime in the final, 6–3, 6–4.
Roger Federer was the defending champion, but withdrew from the tournament after undergoing surgery on his right knee.
Carlos Alcaraz was the defending champion but chose not to defend his title.
Max Purcell was the defending champion but chose not to defend his title.
Hubert Hurkacz was the reigning champion from when the tournament was last held in 2019, but chose not to participate this year.
Arthur Rinderknech was the defending champion but chose not to defend his title.
Sebastian Ofner was the defending champion but chose not to defend his title.
Pavel Kotov was the defending champion but chose not to participate.
Jenson Brooksby was the defending champion but chose not to defend his title.
Jack Sock was the defending champion but chose not to defend his title.
Maxime Cressy defeated Alexander Bublik in the final, 2–6, 6–3, 7–6(7–3) to win the men's singles tennis title at the 2022 Hall of Fame Open. It was his maiden ATP Tour title.
Norbert Gombos was the defending champion but chose not to defend his title.
Nick Kyrgios defeated Yoshihito Nishioka in the final, 6–4, 6–3 to win the men's singles tennis title at the 2022 Washington Open. It was his second Washington title, following 2019. Kyrgios saved five match points en route to the title, in the quarterfinals against Frances Tiafoe. He also did not drop serve during the tournament.
Yoshihito Nishioka defeated Denis Shapovalov in the final, 6–4, 7–6(7–5) to win the men's singles tennis title at the 2022 Korea Open. It was his first ATP Tour title since Shenzhen in 2018.
Kwon Soon-woo was the defending champion but chose not to defend his title.