# 2009 PTT Thailand Open – Singles

Jo-Wilfried Tsonga was the defending champion, but lost in the semifinals to Viktor Troicki. Gilles Simon won in the final 7–5, 6–3, against Viktor Troicki.

## Seeds

The top four seeds receive a bye into the second round.
* Jo-Wilfried Tsonga (semifinals)
* Gilles Simon (champion)
* Sam Querrey (withdrew due to arm injury)
* Viktor Troicki (final)
* Philipp Petzschner (first round)
* Jürgen Melzer (semifinals)
* Fabrice Santoro (first round)
* John Isner (quarterfinals)

## 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

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Jo-Wilfried Tsonga | 6 | 2 | 3 | | | | |
| 4 | Viktor Troicki | 1 | 6 | 6 | | | | |
| 4 | Viktor Troicki | 1 | 6 | 6 | 4 | Viktor Troicki | 5 | 3 |
| | | | | | 2 | Gilles Simon | 7 | 6 |
| 6 | Jürgen Melzer | 4 | 6$^3$ | | 2 | Gilles Simon | 7 | 6 |
| 2 | Gilles Simon | 6 | 7$^7$ | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | J-W Tsonga | 6$^3$ | 7$^7$ | 7$^7$ | | | | | | | | | | |
| WC | S Devvarman | 6$^7$ | 2 | | | E Gulbis | 7$^7$ | 6$^4$ | 6$^2$ | | | | | | | | | | |
| | E Gulbis | 7$^9$ | 6 | | | | | | | 1 | J-W Tsonga | 6$^7$ | 6 | 6 | | | | | |
| Q | M Chiudinelli | 6 | 6 | | | | | | | Q | M Chiudinelli | 7$^9$ | 3 | 4 | | | | | |
| Q | F Mayer | 3 | 3 | | Q | M Chiudinelli | 6 | 7$^7$ | | | | | | | | | | | |
| | M Safin | 6 | 3 | 6 | | M Safin | 3 | 6$^4$ | | | | | | | | | | | |
| 5 | P Petzschner | 2 | 6 | 1 | | | | | | | | | | | 1 | J-W Tsonga | 6 | 2 | 3 |
| | | | | | | | | | | | | | | | 4 | V Troicki | 1 | 6 | 6 |
| | | | | | 4 | V Troicki | 6 | 7$^7$ | | | | | | | | | | | |
| | T Bellucci | 6 | 7$^9$ | | | T Bellucci | 3 | 6$^4$ | | | | | | | | | | | |
| | G García López | 4 | 6$^7$ | | | | | | | 4 | V Troicki | 7$^7$ | 6 | | | | | | |
| | M Zverev | 5 | 6 | 6 | | | | | | 8 | J Isner | 6$^3$ | 2 | | | | | | |
| | L Mayer | 7 | 3 | 3 | | M Zverev | 6$^5$ | 4 | | | | | | | | | | | |
| WC | K Wachiramanowong | 3 | 6 | 6$^5$ | 8 | J Isner | 7$^7$ | 6 | | | | | | | | | | | |
| 8 | J Isner | 6 | 3 | 7$^7$ | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | J Melzer | 6 | 6 | | | | | | | | | | | | | | | |
| | M Daniel | 3 | 2 | | 6 | J Melzer | 6 | 6 | | | | | | | | | | |
| Q | M İlhan | 4 | 7$^7$ | 6 | Q | M İlhan | 4 | 2 | | | | | | | | | | |
| | B Becker | 6 | 6$^4$ | 3 | | | | | | 6 | J Melzer | 6 | 6 | | | | | |
| | A Beck | 7 | 7$^7$ | | | | | | | | A Beck | 4 | 2 | | | | | |
| Q | É Roger-Vasselin | 5 | 6$^1$ | | | A Beck | 6 | 6$^3$ | 6 | | | | | | | | | |
| | | | | | LL | D Young | 1 | 7$^7$ | 4 | | | | | | | | | |
| | | | | | | | | | | | | | | | 6 | J Melzer | 4 | 6$^3$ |
| 7 | F Santoro | 6 | 6$^4$ | 6$^7$ | | | | | | | | | | | 2 | G Simon | 6 | 7$^7$ |
| | E Korolev | 4 | 7$^7$ | 7$^9$ | | E Korolev | 6 | 6 | | | | | | | | | | |
| | R Ginepri | 6 | 6 | | | R Ginepri | 1 | 1 | | | | | | | | | | |
| WC | D Udomchoke | 4 | 3 | | | | | | | | E Korolev | 6 | 3 | 4 | | | | |
| | K Kim | 6 | 6 | | | | | | | 2 | G Simon | 4 | 6 | 6 | | | | |
| | R Schüttler | 4 | 4 | | | K Kim | 2 | 2 | | | | | | | | | | |
| | | | | | 2 | G Simon | 6 | 6 | | | | | | | | | | |