# 2020 Bangkok Challenger – Singles

Henri Laaksonen was the defending champion but chose not to defend his title.
Attila Balázs won the title after defeating Aslan Karatsev 7–6$^{(7–5)}$, 0–6, 7–6$^{(8–6)}$ in the final.

## Seeds

All seeds receive a bye into the second round.
* Jiří Veselý (second round)
* Attila Balázs (champion)
* Robin Haase (second round)
* Denis Istomin (third round)
* Malek Jaziri (second round)
* Roman Safiullin (semifinals)
* Illya Marchenko (second round)
* Evgeny Karlovskiy (quarterfinals)
* Gian Marco Moroni (semifinals)
* Renzo Olivo (third round)
* Teymuraz Gabashvili (withdrew)
* Gonçalo Oliveira (second round)
* Santiago Giraldo (third round)
* JC Aragone (third round)
* Borna Gojo (quarterfinals)
* Daniel Altmaier (second 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| | Aslan Karatsev | 6 | 6 | | | | | | | | | | |
| | Wu Di | 2 | 2 | | | | | | | | | | |
| | Wu Di | 2 | 2 | | Aslan Karatsev | 6 | 6 | | | | | | |
| | | | | 9 | Gian Marco Moroni | 2 | 2 | | | | | | |
| | Andrea Arnaboldi | 2 | 4 | 9 | Gian Marco Moroni | 2 | 2 | | | | | | |
| 9 | Gian Marco Moroni | 6 | 6 | | | | | | | | | | |
| 9 | Gian Marco Moroni | 6 | 6 | | | | | | | Aslan Karatsev | 6$^5$ | 6 | 6$^6$ |
| | | | | | | | | | 2 | Attila Balázs | 7$^7$ | 0 | 7$^8$ |
| 6 | Roman Safiullin | 6 | 6 | | | | | | | | | | | 2 | Attila Balázs | 7$^7$ | 0 | 7$^8$ |
| 15 | Borna Gojo | 4 | 4 | | | | | | | | | | |
| 15 | Borna Gojo | 4 | 4 | 6 | Roman Safiullin | 1 | 7$^7$ | 6$^5$ | | | | | |
| | | | | 2 | Attila Balázs | 6 | 6$^4$ | 7$^7$ | | | | | |
| 8 | Evgeny Karlovskiy | 1 | 5 | 2 | Attila Balázs | 6 | 6$^4$ | 7$^7$ | | | | | |
| 2 | Attila Balázs | 6 | 7 | | | | | | | | | | |

### 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 | J Veselý | 4 | 7$^7$ | 2 | | | | | | | | |
| | A Karatsev | 6 | 6 | | | A Karatsev | 6 | 6$^0$ | 6 | | | | | | | | |
| WC | Congsup Congcar | 0 | 0 | | | | | | | | A Karatsev | 6 | 3 | 6 | | | |
| WC | W Trongcharoenchaikul | 4 | 2 | | | | | | | | M Bašić | 4 | 6 | 4 | | | |
| | M Bašić | 6 | 6 | | | M Bašić | 7$^7$ | 7 | | | | | | | | | |
| | | | | | 16 | D Altmaier | 6$^5$ | 5 | | | | | | | | | |
| | | | | | | | | | | | | | | | A Karatsev | 6 | 6 |
| | | | | | | | | | | | | | | | D Wu | 2 | 2 |
| | | | | | LL | T Brkić | 7$^7$ | 4 | 1 | | | | | | | | |
| | U Ignatik | 6 | 6$^5$ | 0$^r$ | Q | V Orlov | 6$^2$ | 6 | 6 | | | | | | | | |
| Q | V Orlov | 3 | 7$^7$ | 2 | | | | | | Q | V Orlov | 6 | 4 | 3 | | | |
| | E King | 3 | 2 | | | | | | | | D Wu | 2 | 6 | 6 | | | |
| | D Wu | 6 | 6 | | | D Wu | 6 | 7$^7$ | | | | | | | | | |
| | | | | | 7 | I Marchenko | 1 | 6$^5$ | | | | | | | | | |

#### 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 |
| | | | | | 3 | R Haase | 3 | 6 | 1 | | | | | | | | | |
| | C İlkel | 6 | 4 | 5 | | A Arnaboldi | 6 | 3 | 6 | | | | | | | | | |
| | A Arnaboldi | 3 | 6 | 7 | | | | | | | A Arnaboldi | 4 | 7$^7$ | 6 | | | | |
| Alt | S Doumbia | 2 | 4 | | | | | | | 13 | S Giraldo | 6 | 6$^2$ | 4 | | | | |
| Q | Sidharth Rawat | 6 | 6 | | Q | S Rawat | 6 | 6$^5$ | 4 | | | | | | | | | |
| | | | | | 13 | S Giraldo | 3 | 7$^7$ | 6 | | | | | | | | | |
| | | | | | | | | | | | | | | | | A Arnaboldi | 2 | 4 |
| | | | | | | | | | | | | | | | 9 | GM Moroni | 6 | 6 |
| | | | | | 9 | GM Moroni | 6 | 7$^9$ | | | | | | | | | | |
| | A Pellegrino | 6 | 3 | 2 | | V Durasovic | 4 | 6$^7$ | | | | | | | | | | |
| | V Durasovic | 2 | 6 | 6 | | | | | | 9 | GM Moroni | 3 | 6 | 6 | | | | |
| WC | K Samrej | 1 | 2 | | | | | | | | C-h Tseng | 6 | 4 | 3 | | | | |
| | C-h Tseng | 6 | 6 | | | C-h Tseng | 6 | 6 | | | | | | | | | | |
| | | | | | 5 | M Jaziri | 3 | 3 | | | | | | | | | | |

### 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 | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 6 | R Safiullin | 6 | 6 | | | | | | | | |
| | F Peliwo | 7 | 3 | 6 | | F Peliwo | 2 | 3 | | | | | | | | |
| | G Escobar | 5 | 6 | 4 | | | | | 6 | R Safiullin | 6 | 6 | | | | |
| | T-h Yang | 3 | 4 | | | | | | | Ze Zhang | 2 | 1 | | | | |
| | Ze Zhang | 6 | 6 | | | Ze Zhang | 6 | 6 | | | | | | | | |
| | | | | | 12 | G Oliveira | 4 | 2 | | | | | | | | |
| | | | | | | | | | | | | | 6 | R Safiullin | 6 | 6 |
| | | | | | | | | | | | | | 15 | B Gojo | 4 | 4 |
| | | | | | 15 | B Gojo | 6 | 6 | | | | | | | | |
| WC | Michael Mathayomchand | 3 | 0 | | | A Nedovyesov | 1 | 4 | | | | | | | | |
| | A Nedovyesov | 6 | 6 | | | | | | 15 | B Gojo | 6 | 6 | | | | |
| | J Draper | 7$^7$ | 6 | | | | | | 4 | D Istomin | 3 | 0 | | | | |
| | Y-s Chung | 6$^5$ | 3 | | | J Draper | 4 | 2 | | | | | | | | |
| | | | | | 4 | D Istomin | 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 | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 8 | E Karlovskiy | 7$^8$ | 6 | | | | | | | | | |
| | K Uchida | 1 | 6 | 1 | | L Klein | 6$^6$ | 4 | | | | | | | | | |
| | L Klein | 6 | 3 | 6 | | | | | 8 | E Karlovskiy | 6 | 7$^7$ | | | | | |
| WC | P Kovapitukted | 2 | 6 | 6 | | | | | 10 | R Olivo | 0 | 6$^3$ | | | | | |
| | A Çelikbilek | 6 | 2 | 1 | WC | P Kovapitukted | 6$^3$ | 6$^4$ | | | | | | | | | |
| | | | | | 10 | R Olivo | 7$^7$ | 7$^7$ | | | | | | | | | |
| | | | | | | | | | | | | | | 8 | E Karlovskiy | 1 | 5 |
| | | | | | | | | | | | | | | 2 | A Balázs | 6 | 7 |
| | | | | | 14 | JC Aragone | 7$^7$ | 6 | | | | | | | | | |
| | A Molčan | 6 | 6 | | | A Molčan | 6$^2$ | 1 | | | | | | | | | |
| | A De Greef | 2 | 2 | | | | | | 14 | JC Aragone | 3 | 6 | 4 | | | | |
| | J Rodionov | 2 | 3 | | | | | | 2 | A Balázs | 6 | 3 | 6 | | | | |
| | D Yevseyev | 6 | 6 | | | D Yevseyev | 3 | 5 | | | | | | | | | |
| | | | | | 2 | A Balázs | 6 | 7 | | | | | | | | | |