# 2011 Heineken Open – Singles

John Isner was the defending champion but lost in the quarterfinals to David Nalbandian. David Ferrer won the title, defeating Nalbandian 6–3, 6–2 in the final.

## Seeds

The top four seeds receive a bye to the second round.
* David Ferrer (champion)
* Nicolás Almagro (semifinals)
* John Isner (quarterfinals)
* Albert Montañés (second round)
* Juan Mónaco (first round)
* David Nalbandian (final)
* Thomaz Bellucci (quarterfinals)
* Philipp Kohlschreiber (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 | Final | Final | Final | Final |
| 1 | David Ferrer | 6 | 7 | | | | |
| | Santiago Giraldo | 3 | 5 | | | | |
| | Santiago Giraldo | 3 | 5 | 1 | David Ferrer | 6 | 6 |
| | | | | 6 | David Nalbandian | 3 | 2 |
| 6 | David Nalbandian | 6 | 6 | 6 | David Nalbandian | 3 | 2 |
| 2/WC | Nicolás Almagro | 4 | 2 | | | | |

### 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 | D Ferrer | 3 | 7 | 6 | | | | | | | | | |
| Q | P Riba | 3 | 4 | | | T Kamke | 6 | 6$^1$ | 4 | | | | | | | | | |
| | T Kamke | 6 | 6 | | | | | | | 1 | D Ferrer | 6 | 6$^4$ | 6 | | | | |
| Q | B Reynolds | 4 | 3 | | | | | | | 8 | P Kohlschreiber | 3 | 7 | 3 | | | | |
| | M Granollers | 6 | 6 | | | M Granollers | 4 | 6 | 2 | | | | | | | | | |
| | C Berlocq | 6 | 3 | 1 | 8 | P Kohlschreiber | 6 | 3 | 6 | | | | | | | | | |
| 8 | P Kohlschreiber | 2 | 6 | 6 | | | | | | | | | | | 1 | D Ferrer | 6 | 7 |
| | | | | | | | | | | | | | | | | S Giraldo | 3 | 5 |
| | | | | | 4 | A Montañés | 3 | 6 | 4 | | | | | | | | | |
| | S Giraldo | 6 | 6 | | | S Giraldo | 6 | 4 | 6 | | | | | | | | | |
| | D Gimeno Traver | 2 | 4 | | | | | | | | S Giraldo | 6 | 6 | | | | | |
| WC | M Venus | 7 | 3 | 0 | | | | | | 7 | T Bellucci | 2 | 4 | | | | | |
| | T Robredo | 6$^6$ | 6 | 6 | | T Robredo | 4 | 6 | 1 | | | | | | | | | |
| Q | M Russell | 4 | 7 | 5 | 7 | T Bellucci | 6 | 3 | 6 | | | | | | | | | |
| 7 | T Bellucci | 6 | 6$^4$ | 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 | D Nalbandian | 7 | 6 | | | | | | | | | | | | | | | |
| | F Fognini | 6$^3$ | 4 | | 6 | D Nalbandian | 6 | 6 | | | | | | | | | | |
| | T de Bakker | 1 | 7 | 6$^3$ | | P Petzschner | 3 | 2 | | | | | | | | | | |
| | P Petzschner | 6 | 6$^5$ | 7 | | | | | | 6 | D Nalbandian | 6 | 7 | | | | | |
| | R Haase | 3 | 7 | 7 | | | | | | 3 | J Isner | 4 | 6$^3$ | | | | | |
| | P Cuevas | 6 | 6$^3$ | 6$^3$ | | R Haase | 6 | 6$^4$ | 5 | | | | | | | | | |
| | | | | | 3 | J Isner | 3 | 7 | 7 | | | | | | | | | |
| | | | | | | | | | | | | | | | 6 | D Nalbandian | 6 | 6 |
| 5 | J Mónaco | 4 | 3 | | | | | | | | | | | | 2/WC | N Almagro | 4 | 2 |
| Q | A Mannarino | 6 | 6 | | Q | A Mannarino | 7 | 6 | | | | | | | | | | |
| WC | A Clément | 4 | 6 | 7 | WC | A Clément | 5 | 4 | | | | | | | | | | |
| | X Malisse | 6 | 2 | 5 | | | | | | Q | A Mannarino | 6$^3$ | 7 | 2 | | | | |
| | V Hănescu | 7 | 6$^3$ | 6 | | | | | | 2/WC | N Almagro | 7 | 6$^1$ | 6 | | | | |
| | K Anderson | 6$^7$ | 7 | 4 | | V Hănescu | 4 | 6$^3$ | | | | | | | | | | |
| | | | | | 2/WC | N Almagro | 6 | 7 | | | | | | | | | | |