# 2019 Bangkok Challenger – Singles

Marcel Granollers was the defending champion but chose not to defend his title.
Henri Laaksonen won the title after defeating Dudi Sela 6–2, 6–4 in the final.

## Seeds

All seeds receive a bye into the second round.
* Prajnesh Gunneswaran (second round)
* Tatsuma Ito (semifinals, retired)
* Henri Laaksonen (champion)
* Corentin Moutet (second round)
* Yūichi Sugita (third round)
* Marc Polmans (second round)
* Hiroki Moriya (second round)
* Viktor Troicki (third round)
* Aleksandr Nedovyesov (second round)
* Tobias Kamke (quarterfinals)
* Zhang Ze (second round)
* Go Soeda (quarterfinals)
* Gianluca Mager (third round, retired)
* Dudi Sela (final)
* Alejandro Davidovich Fokina (third round)
* Thiemo de Bakker (third round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| | JC Aragone | 6$^3$ | 5 | | | | | | | | | | |
| | James Duckworth | 7$^7$ | 7 | | | | | | | | | | |
| | James Duckworth | 7$^7$ | 7 | | | James Duckworth | 6$^5$ | 7 | 4 | | | | |
| | | | | | 3 | Henri Laaksonen | 7$^7$ | 5 | 6 | | | | |
| 3 | Henri Laaksonen | 7$^7$ | 4 | 6 | 3 | Henri Laaksonen | 7$^7$ | 5 | 6 | | | | |
| 12 | Go Soeda | 6$^4$ | 6 | 3 | | | | | | | | | |
| 12 | Go Soeda | 6$^4$ | 6 | 3 | | | | | | 3 | Henri Laaksonen | 6 | 6 |
| | | | | | | | | | | 14 | Dudi Sela | 2 | 4 |
| 10 | Tobias Kamke | 6 | 4 | 2 | | | | | | | | | | 14 | Dudi Sela | 2 | 4 |
| 14 | Dudi Sela | 1 | 6 | 6 | | | | | | | | | |
| 14 | Dudi Sela | 1 | 6 | 6 | 14 | Dudi Sela | 4 | | | | | | |
| | | | | | 2 | Tatsuma Ito | 2$^r$ | | | | | | |
| | Kwon Soon-woo | 3 | 6 | 1 | 2 | Tatsuma Ito | 2$^r$ | | | | | | |
| 2 | Tatsuma Ito | 6 | 4 | 6 | | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | P Gunneswaran | 3 | 1 | | | | | | | | | |
| | JC Aragone | 6 | 6 | | | JC Aragone | 6 | 6 | | | | | | | | | |
| | G Elias | 4 | 2 | | | | | | | | JC Aragone | 7$^9$ | 6$^5$ | 2 | | | |
| | G Oliveira | 4 | 4 | | | | | | | 13 | G Mager | 6$^7$ | 7$^7$ | 0$^r$ | | | |
| | E López Pérez | 6 | 6 | | | E López Pérez | 5 | 3 | | | | | | | | | |
| | | | | | 13 | G Mager | 7 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | | JC Aragone | 6$^3$ | 5 |
| | | | | | | | | | | | | | | | J Duckworth | 7$^7$ | 7 |
| | | | | | 11 | Ze Zhang | 5 | 3 | | | | | | | | | |
| | J Duckworth | 6 | 7 | | | J Duckworth | 7 | 6 | | | | | | | | | |
| ITF | I Nedelko | 3 | 5 | | | | | | | | J Duckworth | 4 | 6 | 6 | | | |
| | T-h Yang | 2 | 6 | 4 | | | | | | WC | J Tipsarević | 6 | 3 | 2 | | | |
| WC | J Tipsarević | 6 | 4 | 6 | WC | J Tipsarević | 6 | 3 | 6 | | | | | | | | |
| | | | | | 6 | M Polmans | 2 | 6 | 3 | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 3 | H Laaksonen | 6 | 6 | | | | | | | | | | |
| | S Robert | 5 | 6 | 6 | | S Robert | 3 | 1 | | | | | | | | | | |
| WC | P Kovapitukted | 7 | 3 | 4 | | | | | | 3 | H Laaksonen | 6 | 6 | | | | | |
| | Z Li | 6 | 7$^9$ | | | | | | | 16 | T de Bakker | 4 | 3 | | | | | |
| | S Myneni | 4 | 6$^7$ | | | Z Li | 4 | 6 | 4 | | | | | | | | | |
| | | | | | 16 | T de Bakker | 6 | 4 | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | 3 | H Laaksonen | 7$^7$ | 4 | 6 |
| | | | | | | | | | | | | | | 12 | G Soeda | 6$^4$ | 6 | 3 |
| | | | | | 12 | G Soeda | 6 | 6 | | | | | | | | | | |
| | B Mousley | 2 | 6 | 2 | WC | P Wattanakul | 3 | 3 | | | | | | | | | | |
| WC | Pol Wattanakul | 6 | 3 | 6 | | | | | | 12 | G Soeda | 6 | 6 | | | | | |
| WC | W Trongcharoenchaikul | 3 | 3 | | | | | | | 8 | V Troicki | 0 | 4 | | | | | |
| | D-h Lee | 6 | 6 | | | D-h Lee | 1 | 2 | | | | | | | | | | |
| | | | | | 8 | V Troicki | 6 | 6 | | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 5 | Y Sugita | 6 | 6 | | | | | | | | | | | |
| Q | E Tiurnev | 3 | 1 | | ITF | D Kuzmanov | 4 | 4 | | | | | | | | | | | |
| ITF | D Kuzmanov | 6 | 6 | | | | | | | 5 | Y Sugita | 6 | 0 | 4 | | | | | |
| Alt | D Yevseyev | 6 | 6 | | | | | | | 10 | T Kamke | 3 | 6 | 6 | | | | | |
| | C Hemery | 2 | 2 | | Alt | D Yevseyev | 5 | 1 | | | | | | | | | | | |
| | | | | | 10 | T Kamke | 7 | 6 | | | | | | | | | | | |
| | | | | | | | | | | | | | | | 10 | T Kamke | 6 | 4 | 2 |
| | | | | | | | | | | | | | | | 14 | D Sela | 1 | 6 | 6 |
| | | | | | 14 | D Sela | 6$^5$ | 6 | 6 | | | | | | | | | | |
| | D Wu | 7$^7$ | 2 | 2 | | L Grigelis | 7$^7$ | 0 | 2 | | | | | | | | | | |
| | L Grigelis | 6$^3$ | 6 | 6 | | | | | | 14 | D Sela | 6 | 6 | | | | | | |
| | K King | 4 | 7$^7$ | 3 | | | | | | | M Purcell | 2 | 2 | | | | | | |
| | M Purcell | 6 | 6$^3$ | 6 | | M Purcell | 1 | 6 | 6 | | | | | | | | | | |
| | | | | | 4 | C Moutet | 6 | 3 | 3 | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 7 | H Moriya | 1 | 5 | | | | | | | | | | | |
| | S-w Kwon | 6 | 6 | | S-w Kwon | 6 | 7 | | | | | | | | | | | |
| | S Mukund | 1 | 1 | | | | | | | S-w Kwon | 6 | 6 | | | | | | |
| ITF | O Roca Batalla | 7$^7$ | 7 | | | | | | ITF | O Roca Batalla | 1 | 1 | | | | | | |
| | E Couacaud | 6$^5$ | 5 | ITF | O Roca Batalla | 6 | 3 | 7$^9$ | | | | | | | | | | |
| | | | | 9 | A Nedovyesov | 2 | 6 | 6$^7$ | | | | | | | | | | |
| | | | | | | | | | | | | | | | S-w Kwon | 3 | 6 | 1 |
| | | | | | | | | | | | | | | 2 | T Ito | 6 | 4 | 6 |
| | | | | 15 | A Davidovich Fokina | 6 | 7 | | | | | | | | | | | |
| | J Hernández-Fernández | 6 | 6 | | J Hernández-Fernández | 4 | 5 | | | | | | | | | | | |
| Q | I Gakhov | 4 | 1 | | | | | | 15 | A Davidovich Fokina | 6 | 3 | 4 | | | | | |
| WC | Natthasith Kunsuwan | 2 | 4 | | | | | | 2 | T Ito | 1 | 6 | 6 | | | | | |
| ITF | D Pérez Sanz | 6 | 6 | ITF | D Pérez Sanz | 4 | 2 | | | | | | | | | | | |
| | | | | 2 | T Ito | 6 | 6 | | | | | | | | | | | |