# 2011 Natomas Men's Professional Tennis Tournament – Singles

John Millman was the defending champion, but did not participate. Ivo Karlović won the title, defeating James Blake 6–4, 3–6, 6–4 in the final.

## Seeds

* James Blake (final)
* Ivo Karlović (champion)
* Sam Querrey (semifinals)
* Bobby Reynolds (quarterfinals)
* Vasek Pospisil (first round)
* Izak van der Merwe (second round)
* Björn Phau (second round)
* James Ward (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 | Semifinals | Final | Final | Final | Final | Final |
| 1 | James Blake | 6 | 7 | | | | | | |
| | Alex Kuznetsov | 2 | 5 | | | | | | |
| | Alex Kuznetsov | 2 | 5 | | 1 | James Blake | 4 | 6 | 4 |
| | | | | | 2 | Ivo Karlović | 6 | 3 | 6 |
| 3/WC | Sam Querrey | 6$^6$ | 6 | 4 | 2 | Ivo Karlović | 6 | 3 | 6 |
| 2 | Ivo Karlović | 7$^8$ | 3 | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | J Blake | 6 | 7 | | | | | | | | | | | | | | |
| | A Delić | 4 | 5 | | 1 | J Blake | 6 | 6 | | | | | | | | | |
| | C Guccione | 6 | 6 | | | C Guccione | 4 | 4 | | | | | | | | | |
| | JS Cabal | 3 | 4 | | | | | | | 1 | J Blake | 6 | 6 | | | | |
| | R Borvanov | 3 | 6 | 6 | | | | | | WC | J Sock | 4 | 2 | | | | |
| Q | S Johnson | 6 | 4 | 3 | | R Borvanov | 1 | 6 | 3 | | | | | | | | |
| WC | J Sock | 6 | 7$^7$ | | WC | J Sock | 6 | 3 | 6 | | | | | | | | |
| 8 | J Ward | 3 | 6$^3$ | | | | | | | | | | | 1 | J Blake | 6 | 7 |
| 4 | B Reynolds | 6 | 2 | 7 | | | | | | | | | | | A Kuznetsov | 2 | 5 |
| | C Salamanca | 3 | 6 | 5 | 4 | B Reynolds | 6 | 5 | 6 | | | | | | | | |
| | F Nielsen | 6 | 5 | 6 | | F Nielsen | 2 | 7 | 2 | | | | | | | | |
| WC | N Monroe | 2 | 7 | 4 | | | | | | 4 | B Reynolds | 6$^0$ | 3 | | | | |
| | S Greul | 6 | 4 | 4 | | | | | | | A Kuznetsov | 7$^7$ | 6 | | | | |
| | A Kuznetsov | 4 | 6 | 6 | | A Kuznetsov | 6 | 6 | | | | | | | | | |
| Q | B Strode | 3 | 4 | | 6 | I van der Merwe | 4 | 2 | | | | | | | | | |
| 6 | I van der Merwe | 6 | 6 | | | | | | | | | | | | | | |

### 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 | Semifinals |
| 7 | B Phau | 6 | 6 | | | | | | | | | | | | | | | |
| SE | R Farah | 1 | 4 | | 7 | B Phau | 4 | 6$^4$ | | | | | | | | | | |
| | U Ignatik | 3 | 6 | 6 | | U Ignatik | 6 | 7$^7$ | | | | | | | | | | |
| | F Wolmarans | 6 | 3 | 4 | | | | | | | U Ignatik | 5 | 6$^9$ | | | | | |
| | D Gremelmayr | 6 | 3 | 6 | | | | | | 3/WC | S Querrey | 7 | 7$^{11}$ | | | | | |
| LL | J Baker | 1 | 6 | 4 | | D Gremelmayr | 7$^7$ | 6$^1$ | 3 | | | | | | | | | |
| | L Grigelis | 4 | 7$^7$ | 2 | 3/WC | S Querrey | 6$^4$ | 7$^7$ | 6 | | | | | | | | | |
| 3/WC | S Querrey | 6 | 6$^5$ | 6 | | | | | | | | | | 3/WC | S Querrey | 6$^6$ | 6 | 4 |
| 5 | V Pospisil | 7$^7$ | 6$^2$ | 3 | | | | | | | | | | 2 | I Karlović | 7$^8$ | 3 | 6 |
| | T de Bakker | 6$^5$ | 7$^7$ | 6 | | T de Bakker | 6 | 2 | 6 | | | | | | | | | |
| | T Smyczek | 2 | 5 | | Q | P-L Duclos | 4 | 6 | 4 | | | | | | | | | |
| Q | P-L Duclos | 6 | 7 | | | | | | | | T de Bakker | 4 | 6$^2$ | | | | | |
| Q | M Venus | 2 | 4 | | | | | | | 2 | I Karlović | 6 | 7$^7$ | | | | | |
| | V Estrella | 6 | 6 | | | V Estrella | 3 | 2 | | | | | | | | | | |
| | M Fischer | 3 | 6 | 6$^8$ | 2 | I Karlović | 6 | 6 | | | | | | | | | | |
| 2 | I Karlović | 6 | 3 | 7$^{10}$ | | | | | | | | | | | | | | |