# 2011 Zagreb Open – Men's singles

Yuri Schukin was the defending champion but chose to compete in Bordeaux instead. Diego Junqueira won this tournament. He defeated João Souza 6–3, 6–4 in the final.

## Seeds

* Ivan Dodig (quarterfinals)
* Somdev Devvarman (first round)
* Denis Gremelmayr (second round)
* Rubén Ramírez Hidalgo (first round)
* Jaroslav Pospíšil (first round)
* Björn Phau (first round)
* Dustin Brown (second round)
* Lukáš Lacko (first 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 |
| | Martin Kližan | 5 | 3 | | | | |
| | Diego Junqueira | 7 | 6 | | | | |
| | Diego Junqueira | 7 | 6 | Diego Junqueira | Diego Junqueira | 6 | 6 |
| | | | | João Souza | João Souza | 3 | 4 |
| Q | Andrea Arnaboldi | 5 | 6$^6$ | João Souza | João Souza | 3 | 4 |
| | João Souza | 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 |
| 1 | I Dodig | 6 | 6 | | | | | | | | | | | | | | |
| | R de Voest | 3 | 2 | | 1 | I Dodig | 6$^3$ | 6 | 7 | | | | | | | | |
| | J Janowicz | 6 | 3 | 6 | | J Janowicz | 7 | 4 | 5 | | | | | | | | |
| | I van der Merwe | 3 | 6 | 4 | | | | | | 1 | I Dodig | 6$^2$ | 6 | 3 | | | |
| | M Kližan | 6 | 6 | | | | | | | | M Kližan | 7 | 2 | 6 | | | |
| | S Greul | 2 | 2 | | | M Kližan | 6 | 6 | | | | | | | | | |
| | S Vagnozzi | 2 | 6 | 3 | 7 | D Brown | 4 | 3 | | | | | | | | | |
| 7 | D Brown | 6 | 2 | 6 | | | | | | | | | | | M Kližan | 5 | 3 |
| 3 | D Gremelmayr | 6 | 7 | | | | | | | | | | | | D Junqueira | 7 | 6 |
| | D Muñoz-De La Nava | 4 | 6$^5$ | | 3 | D Gremelmayr | 2 | 7 | 6$^6$ | | | | | | | | |
| | P Luczak | 3 | 4 | | Q | N Mektić | 6 | 5 | 7 | | | | | | | | |
| Q | N Mektić | 6 | 6 | | | | | | | Q | N Mektić | 6$^8$ | 2 | | | | |
| Q | G Alcaide | 6 | 6 | | | | | | | | D Junqueira | 7 | 6 | | | | |
| WC | T Muster | 3 | 4 | | Q | G Alcaide | 6$^4$ | 2 | | | | | | | | | |
| | D Junqueira | 6 | 6 | | | D Junqueira | 7 | 6 | | | | | | | | | |
| 8 | L Lacko | 3 | 3 | | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | J Pospíšil | 4 | 2 | | | | | | | | | | | | | | |
| WC | K Mesaroš | 6 | 6 | | WC | K Mesaroš | 7 | 6 | | | | | | | | | |
| | L Mayer | 6 | 4 | 6 | | L Mayer | 6$^7$ | 0 | | | | | | | | | |
| | R Harrison | 4 | 6 | 3 | | | | | | WC | K Mesaroš | 1 | 4 | | | | |
| | M Chiudinelli | 3 | 4 | | | | | | | Q | A Arnaboldi | 6 | 6 | | | | |
| Q | Andrea Arnaboldi | 6 | 6 | | Q | A Arnaboldi | 3 | 6 | 6 | | | | | | | | |
| WC | B Puc | 6 | 2 | 6 | WC | B Puc | 6 | 3 | 3 | | | | | | | | |
| 4 | R Ramírez Hidalgo | 4 | 6 | 3 | | | | | | | | | | Q | A Arnaboldi | 5 | 6$^6$ |
| 6 | B Phau | 4 | 3 | | | | | | | | | | | | J Souza | 7 | 7 |
| | B Knittel | 6 | 6 | | | B Knittel | 4 | 1 | | | | | | | | | |
| Q | A Kuznetsov | 7 | 3 | 1 | | J Souza | 6 | 6 | | | | | | | | | |
| | J Souza | 6$^4$ | 6 | 6 | | | | | | | J Souza | 6 | 7 | | | | |
| | D Meffert | 7 | 7 | | | | | | | | D Meffert | 0 | 5 | | | | |
| | F Škugor | 6$^3$ | 6$^5$ | | | D Meffert | 6 | 6 | | | | | | | | | |
| WC | A Veić | 6 | 6 | | WC | A Veić | 4 | 2 | | | | | | | | | |
| 2 | S Devvarman | 3 | 2 | | | | | | | | | | | | | | |