# 2012 Comerica Bank Challenger – Singles

Laurynas Grigelis was the defending champion, but did not participate this year. Steve Johnson won the title, defeating Robert Farah 6–3, 6–3 in the final.

## Seeds

* Brian Baker (first round)
* Igor Andreev (first round)
* Rajeev Ram (first round)
* Igor Sijsling (withdrew due to gastroenteritis)
* Tobias Kamke (first round)
* Florent Serra (second round)
* Izak van der Merwe (first round)
* Denis Kudla (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 |
| | Jan Hernych | 3 | 4 | | | | | |
| WC | Steve Johnson | 6 | 6 | | | | | |
| WC | Steve Johnson | 6 | 6 | | WC | Steve Johnson | 6 | 6 |
| | | | | | | Robert Farah | 3 | 3 |
| Q | Ilija Bozoljac | 6 | 2 | 4 | | Robert Farah | 3 | 3 |
| | Robert Farah | 4 | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 1/WC | B Baker | 7 | 4 | 2 | | | | | | | | | | | | | |
| | M Authom | 5 | 6 | 6 | | M Authom | 4 | 6 | 1 | | | | | | | | |
| | M Copil | 3 | 6 | 3 | | J Wang | 6 | 4 | 6 | | | | | | | | |
| | J Wang | 6 | 2 | 6 | | | | | | | J Wang | 3 | 6$^5$ | | | | |
| | F Romboli | 4 | 4 | | | | | | | | J Hernych | 6 | 7$^7$ | | | | |
| | J Hernych | 6 | 6 | | | J Hernych | 7 | 6 | | | | | | | | | |
| SE | S Bubka | 6 | 7$^7$ | | | S Bubka | 5 | 3 | | | | | | | | | |
| 5 | T Kamke | 3 | 6$^3$ | | | | | | | | | | | | J Hernych | 3 | 4 |
| 3 | R Ram | 3 | 4 | | | | | | | | | | | WC | S Johnson | 6 | 6 |
| Q | D Tursunov | 6 | 6 | | Q | D Tursunov | 4 | r | | | | | | | | | |
| | C Salamanca | 3 | 5 | | WC | S Johnson | 6 | | | | | | | | | | |
| WC | S Johnson | 6 | 7 | | | | | | | WC | S Johnson | 6 | 6 | | | | |
| | M Yani | 3 | 1 | | | | | | | | R de Voest | 3 | 4 | | | | |
| Q | J Dadamo | 6 | 6 | | Q | J Dadamo | 2 | 7 | 3 | | | | | | | | |
| | R de Voest | 6 | 6 | | | R de Voest | 6 | 5 | 6 | | | | | | | | |
| 8 | D Kudla | 2 | 2 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | F Serra | 6 | 3 | 6 | | | | | | | | | | | | | |
| | G Pella | 3 | 6 | 2 | 6 | F Serra | 3 | 4 | | | | | | | | | |
| | M Zverev | 5 | 6 | 1 | Q | I Bozoljac | 6 | 6 | | | | | | | | | |
| Q | I Bozoljac | 7 | 4 | 6 | | | | | Q | I Bozoljac | 7$^7$ | 6 | | | | | |
| | J Baker | 3 | 1 | | | | | | LL | M McClune | 6$^4$ | 2 | | | | | |
| WC | R Ginepri | 6 | 6 | | WC | R Ginepri | 1 | 6$^4$ | | | | | | | | | |
| | A Kuznetsov | 4 | 6 | 6$^2$ | LL | M McClune | 6 | 7$^7$ | | | | | | | | | |
| LL | M McClune | 6 | 2 | 7$^7$ | | | | | | | | | Q | I Bozoljac | 6 | 2 | 4 |
| 7 | I van der Merwe | 4 | 6$^1$ | | | | | | | | | | | R Farah | 4 | 6 | 6 |
| | A Weintraub | 6 | 7$^7$ | | | A Weintraub | 6$^2$ | 3 | | | | | | | | | |
| | R Farah | 4 | 6 | 6 | | R Farah | 7$^7$ | 6 | | | | | | | | | |
| | R Borvanov | 6 | 4 | 2 | | | | | | R Farah | 6 | 7 | | | | | |
| | T-h Yang | 5 | 6 | 6$^3$ | | | | | WC | B Klahn | 4 | 5 | | | | | |
| Q | M Reid | 7 | 0 | 7$^7$ | Q | M Reid | 5 | 4 | | | | | | | | | |
| WC | B Klahn | 7$^7$ | 6 | | WC | B Klahn | 7 | 6 | | | | | | | | | |
| 2 | I Andreev | 6$^3$ | 4 | | | | | | | | | | | | | | |