# 2011 St. Petersburg Open – Singles

Mikhail Kukushkin was the defending champion but lost to Michael Berrer in the first round.
Marin Čilić won the tournament beating Janko Tipsarević in the final, 6–3, 3–6, 6–2.

## Seeds

* Gilles Simon (first round)
* Janko Tipsarević (final)
* Alexandr Dolgopolov (first round)
* Marin Čilić (champion)
* Mikhail Youzhny (semifinals)
* Marcel Granollers (first round)
* Alex Bogomolov Jr. (semifinals)
* Dmitry Tursunov (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

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 5 | Mikhail Youzhny | 3 | 4 | | | | | |
| 4 | Marin Čilić | 6 | 6 | | | | | |
| 4 | Marin Čilić | 6 | 6 | 4 | Marin Čilić | 6 | 3 | 6 |
| | | | | 2 | Janko Tipsarević | 3 | 6 | 2 |
| 7 | Alex Bogomolov Jr. | 2 | 1 | 2 | Janko Tipsarević | 3 | 6 | 2 |
| 2 | Janko Tipsarević | 6 | 6 | | | | | |

### 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 |
| 1 | G Simon | 6 | 4 | 4 | | | | | | | | | | | | | | |
| | A Mannarino | 2 | 6 | 6 | | A Mannarino | 6 | 7$^7$ | | | | | | | | | | |
| WC | E Gulbis | 3 | 4 | | | L Rosol | 2 | 6$^5$ | | | | | | | | | | |
| | L Rosol | 6 | 6 | | | | | | | | A Mannarino | 2 | 3 | | | | | |
| | P Riba | 2 | 1 | | | | | | | 5 | M Youzhny | 6 | 6 | | | | | |
| | J Benneteau | 6 | 6 | | | J Benneteau | 4 | 6 | 2 | | | | | | | | | |
| | S Stakhovsky | 3 | 6$^7$ | | 5 | M Youzhny | 6 | 3 | 6 | | | | | | | | | |
| 5 | M Youzhny | 6 | 7$^9$ | | | | | | | | | | | | 5 | M Youzhny | 3 | 4 |
| 4 | M Čilić | 6 | 7$^7$ | | | | | | | | | | | | 4 | M Čilić | 6 | 6 |
| Q | S Bubka | 4 | 6$^1$ | | 4 | M Čilić | 5 | 6 | 6 | | | | | | | | | |
| | S Devvarman | 6 | 6 | | | S Devvarman | 7 | 1 | 3 | | | | | | | | | |
| | K Beck | 2 | 3 | | | | | | | 4 | M Čilić | 4 | 7$^{10}$ | 6 | | | | |
| Q | V Pospisil | 5 | 6$^4$ | | | | | | | | A Seppi | 6 | 6$^8$ | 4 | | | | |
| | A Seppi | 7 | 7$^7$ | | | A Seppi | 3 | 6 | 6 | | | | | | | | | |
| | I Andreev | 3 | 6 | 7$^7$ | | I Andreev | 6 | 2 | 4 | | | | | | | | | |
| 6 | M Granollers | 6 | 4 | 6$^4$ | | | | | | | | | | | | | | |

### 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 |
| 7 | A Bogomolov Jr. | 6 | 6 | | | | | | | | | | | | | | | |
| | I Kunitsyn | 3 | 1 | | 7 | A Bogomolov Jr. | 6 | 3 | 7 | | | | | | | | | |
| | C Berlocq | 7 | 3 | 1 | | P Kohlschreiber | 4 | 6 | 5 | | | | | | | | | |
| | P Kohlschreiber | 6$^4$ | 6 | 6 | | | | | | 7 | A Bogomolov Jr. | 6 | 6 | | | | | |
| SE | J Chardy | 4 | 4 | | | | | | | Q | D Lajović | 2 | 1 | | | | | |
| Q | D Lajović | 6 | 6 | | Q | D Lajović | 2 | 6 | 6 | | | | | | | | | |
| WC | D Sela | 6 | 6 | | WC | D Sela | 6 | 2 | 1 | | | | | | | | | |
| 3 | A Dolgopolov | 2 | 2 | | | | | | | | | | | | 7 | A Bogomolov Jr. | 2 | 1 |
| 8 | D Tursunov | 7 | 6 | | | | | | | | | | | | 2 | J Tipsarević | 6 | 6 |
| Q | T Gabashvili | 5 | 3 | | 8 | D Tursunov | 2 | 4 | | | | | | | | | | |
| | P Starace | 6 | 6 | | | P Starace | 6 | 6 | | | | | | | | | | |
| WC | I Nedelko | 0 | 1 | | | | | | | | P Starace | 7$^8$ | 2 | 1 | | | | |
| | M Kukushkin | 1 | 6 | 4 | | | | | | 2 | J Tipsarević | 6$^6$ | 6 | 6 | | | | |
| | M Berrer | 6 | 4 | 6 | | M Berrer | 3 | 0$^r$ | | | | | | | | | | |
| | O Rochus | 2 | 5 | | 2 | J Tipsarević | 6 | 2 | | | | | | | | | | |
| 2 | J Tipsarević | 6 | 7 | | | | | | | | | | | | | | | |