| 27‑Aug‑2012 | US Open | Hard | R128 | 92 | 70 | Brian Baker [USA] d. Hajek | 6-3 6-4 6-2 | (wp) | 0.85 | 6.6% | 6.6% | 65.8% | 70.0% | 42.3% | 3/7 | 1:56 |
| 30‑Aug‑2010 | US Open | Hard | R128 | 82 | 21 | (19)Mardy Fish [USA] d. Hajek | 6-0 3-6 4-6 6-0 6-1 | | 0.51 | 6.2% | 0.7% | 65.8% | 63.5% | 32.0% | 7/15 | 2:36 |
| 28‑Aug‑2006 | US Open | Hard | R64 | 83 | 11 | (10)Fernando Gonzalez [CHI] d. Hajek | 6-4 6-4 6-2 | | 0.76 | 5.4% | 4.3% | 42.4% | 61.5% | 58.5% | 6/10 | 1:33 |
| 28‑Aug‑2006 | US Open | Hard | R128 | 83 | 96 | Hajek d. Lukas Dlouhy [CZE] | 6-3 6-4 6-4 | | 1.28 | 12.2% | 3.3% | 65.6% | 79.7% | 35.5% | 3/5 | 1:39 |
| 25‑Aug‑2003 | US Open | Hard | Q2 | 286 | 95 | (1)Wesley Moodie [RSA] d. Hajek | 6-7(10) 7-6(6) 7-6(4) | | | | | | | | | |
| 25‑Aug‑2003 | US Open | Hard | Q1 | 286 | 276 | Hajek d. Markus Hipfl [AUT] | 6-1 3-6 6-1 | | | | | | | | | |