# 2019 Bangkok Challenger II – Singles

Marcel Granollers was the defending champion but chose not to defend his title.
James Duckworth won the title after defeating Alejandro Davidovich Fokina 6–4, 6–3 in the final.

## Seeds

All seeds receive a bye into the second round.
* Prajnesh Gunneswaran (semifinals)
* Tatsuma Ito (second round, retired)
* Henri Laaksonen (second round, retired)
* Yūichi Sugita (third round)
* Hiroki Moriya (quarterfinals)
* Aleksandr Nedovyesov (second round)
* Tobias Kamke (second round)
* Zhang Ze (third round)
* Go Soeda (quarterfinals)
* Gianluca Mager (quarterfinals, retired)
* Marc Polmans (third round)
* Viktor Troicki (third round)
* Dudi Sela (semifinals)
* Alejandro Davidovich Fokina (final)
* James Duckworth (champion)
* Kwon Soon-woo (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 |
| 1 | Prajnesh Gunneswaran | 6 | 6 | | | | | | | | | | |
| 9 | Go Soeda | 3 | 3 | | | | | | | | | | |
| 9 | Go Soeda | 3 | 3 | | 1 | Prajnesh Gunneswaran | 6$^2$ | 6 | 6$^3$ | | | | |
| | | | | | 15 | James Duckworth | 7$^7$ | 3 | 7$^7$ | | | | |
| 15 | James Duckworth | 4 | 7$^9$ | 5 | 15 | James Duckworth | 7$^7$ | 3 | 7$^7$ | | | | |
| 10 | Gianluca Mager | 6 | 6$^7$ | 0$^r$ | | | | | | | | | |
| 10 | Gianluca Mager | 6 | 6$^7$ | 0$^r$ | | | | | | 15 | James Duckworth | 6 | 6 |
| | | | | | | | | | | 14 | Alejandro Davidovich Fokina | 4 | 3 |
| 5 | Hiroki Moriya | 2 | 6 | 2 | | | | | | | | | | 14 | Alejandro Davidovich Fokina | 4 | 3 |
| 14 | Alejandro Davidovich Fokina | 6 | 0 | 6 | | | | | | | | | |
| 14 | Alejandro Davidovich Fokina | 6 | 0 | 6 | 14 | Alejandro Davidovich Fokina | 6$^5$ | 6 | 6 | | | | |
| | | | | | 13 | Dudi Sela | 7$^7$ | 4 | 3 | | | | |
| | Li Zhe | 2 | 2 | | 13 | Dudi Sela | 7$^7$ | 4 | 3 | | | | |
| 13 | Dudi Sela | 6 | 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 | Quarterfinals |
| | | | | | 1 | P Gunneswaran | 7 | 3 | 6 | | | | | | | | | |
| ITF | D Yevseyev | 7 | 6 | | ITF | D Yevseyev | 5 | 6 | 4 | | | | | | | | | |
| Q | Y Bai | 5 | 4 | | | | | | | 1 | P Gunneswaran | 7$^7$ | 6 | | | | | |
| | M Banes | 2 | 6 | 6$^3$ | | | | | | 16 | S-w Kwon | 6$^5$ | 4 | | | | | |
| | G Oliveira | 6 | 3 | 7$^7$ | | G Oliveira | 2 | 7$^7$ | 1 | | | | | | | | | |
| | | | | | 16 | S-w Kwon | 6 | 6$^3$ | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | | 1 | P Gunneswaran | 6 | 6 |
| | | | | | | | | | | | | | | | 9 | G Soeda | 3 | 3 |
| | | | | | 9 | G Soeda | 6 | 6 | | | | | | | | | | |
| ITF | O Roca Batalla | 6$^4$ | 6 | 0 | ITF | O Roca Batalla | 4 | 1 | | | | | | | | | | |
| ITF | D Pérez Sanz | 7$^7$ | 2 | 0$^r$ | | | | | | 9 | G Soeda | 6$^4$ | 6 | 6 | | | | |
| | T de Bakker | 6 | 3 | 6 | | | | | | | T de Bakker | 7$^7$ | 2 | 2 | | | | |
| LL | M Echargui | 3 | 6 | 0 | | T de Bakker | 6$^2$ | 6 | 6 | | | | | | | | | |
| | | | | | 6 | A Nedovyesov | 7$^7$ | 4 | 4 | | | | | | | | | |

#### 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 | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 3 | H Laaksonen | 6 | 4 | 0$^r$ | | | | | | | | | | |
| | R Statham | 4 | 5$^r$ | | ITF | D Kuzmanov | 4 | 6 | 2 | | | | | | | | | | |
| ITF | D Kuzmanov | 6 | 5 | | | | | | | ITF | D Kuzmanov | 3 | 1 | | | | | | |
| | T-h Yang | 3 | 5 | | | | | | | 15 | J Duckworth | 6 | 6 | | | | | | |
| | S Myneni | 6 | 7 | | | S Myneni | 4 | 0 | | | | | | | | | | | |
| | | | | | 15 | J Duckworth | 6 | 6 | | | | | | | | | | | |
| | | | | | | | | | | | | | | | 15 | J Duckworth | 4 | 7$^9$ | 5 |
| | | | | | | | | | | | | | | | 10 | G Mager | 6 | 6$^7$ | 0$^r$ |
| | | | | | 10 | G Mager | 6 | 6 | | | | | | | | | | | |
| | Y-s Chung | 6 | 6 | | | Y-s Chung | 4 | 4 | | | | | | | | | | | |
| | P Cachin | 2 | 1 | | | | | | | 10 | G Mager | 6 | 6$^4$ | 6 | | | | | |
| | S Mukund | 7 | 4 | 2 | | | | | | 8 | Ze Zhang | 2 | 7$^7$ | 4 | | | | | |
| | K King | 5 | 6 | 6 | | K King | 6$^3$ | 3 | | | | | | | | | | | |
| | | | | | 8 | Ze Zhang | 7$^7$ | 6 | | | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First 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 | H Moriya | 6 | 7$^{14}$ | | | | | | | | | | |
| | G Elias | 4 | 1 | | Q | I Gakhov | 4 | 6$^{12}$ | | | | | | | | | | |
| Q | I Gakhov | 6 | 6 | | | | | | 5 | H Moriya | 6 | 3 | 6 | | | | | |
| | S Robert | 3 | 6 | 6 | | | | | 12 | V Troicki | 2 | 6 | 1 | | | | | |
| WC | P Isaro | 6 | 1 | 3 | | S Robert | 4 | 4 | | | | | | | | | | |
| | | | | | 12 | V Troicki | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | 5 | H Moriya | 2 | 6 | 2 |
| | | | | | | | | | | | | | | 14 | A Davidovich Fokina | 6 | 0 | 6 |
| | | | | | 14 | A Davidovich Fokina | 6 | 6 | | | | | | | | | | |
| | D-h Lee | 6 | 7$^7$ | | | D-h Lee | 4 | 2 | | | | | | | | | | |
| WC | Thanapet Chanta | 2 | 6$^4$ | | | | | | 14 | A Davidovich Fokina | 6 | 6 | | | | | | |
| WC | P Kovapitukted | 4 | 2 | | | | | | 4 | Y Sugita | 2 | 1 | | | | | | |
| | D Wu | 6 | 6 | | | D Wu | 2 | 4 | | | | | | | | | | |
| | | | | | 4 | Y Sugita | 6 | 6 | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 7 | T Kamke | 2 | 3 | | | | | | | | |
| WC | W Trongcharoenchaikul | 6 | 1 | 4 | | Z Li | 6 | 6 | | | | | | | | |
| | Z Li | 4 | 6 | 6 | | | | | | Z Li | 6 | 6 | | | | |
| | M Purcell | 3 | 1 | | | | | | 11 | M Polmans | 3 | 4 | | | | |
| | K Uchida | 6 | 6 | | | K Uchida | 2 | 5 | | | | | | | | |
| | | | | | 11 | M Polmans | 6 | 7 | | | | | | | | |
| | | | | | | | | | | | | | | Z Li | 2 | 2 |
| | | | | | | | | | | | | | 13 | D Sela | 6 | 6 |
| | | | | | 13 | D Sela | 6 | 6 | | | | | | | | |
| | J Hernández-Fernández | 5 | 2 | | | E Couacaud | 2 | 3 | | | | | | | | |
| | E Couacaud | 7 | 6 | | | | | | 13 | D Sela | 7 | 6 | | | | |
| | E López Pérez | 2 | 2 | | | | | | | JC Aragone | 5 | 2 | | | | |
| | JC Aragone | 6 | 6 | | | JC Aragone | 5 | | | | | | | | | |
| | | | | | 2 | T Ito | 0$^r$ | | | | | | | | | |