The 2011 Serbia Open (also known as Serbia Open 2011 powered by Telekom Srbija for sponsorship reasons) was a men's tennis tournament played on outdoor clay courts. The third edition of the event, hosted by current Serbian player Novak Djokovic, was part of the ATP World Tour 250 series of the 2011 ATP World Tour. It took place at the Tennis Center Novak complex in Belgrade, Serbia from April 23 through May 1. Sam Querrey was the defending champion.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Serbia | Novak Djokovic | 2 | 1 | |
| Serbia | Viktor Troicki | 16 | 2 | |
 Spain | Albert Montañés | 26 | 3 | |
| Spain | Guillermo García López | 27 | 4 | |
| John Isner | 29 | 5 | ||
| Ernests Gulbis | 31 | 6 | ||
| Serbia | Janko Tipsarević | 36 | 7 | |
 Argentina | Juan Mónaco | 37 | 8 |
The following players received wildcards into the main draw:
The following players received special exempts into the main draw:
The following players received entry from the qualifying draw:
See main article: 2011 Serbia Open – Singles qualifying.
See main article: 2011 Serbia Open – Singles. Novak Djokovic def. Feliciano López, 7–6(4), 6–2
See main article: 2011 Serbia Open – Doubles. 
František Čermák / 
Filip Polášek def. 
Oliver Marach / Alexander Peya, 7–5, 6–2
