| 13‑Aug‑2007 | Cincinnati Masters | Hard | R64 | 222 | 24 | Kiefer d. Marat Safin [RUS] | 6-3 7-6(1) | | 1.24 | 18.4% | 2.6% | 57.9% | 79.5% | 50.0% | 5/7 | 1:37 |
| 21‑Feb‑2005 | Dubai | Hard | R32 | 30 | 4 | Kiefer d. (2)Marat Safin [RUS] | 7-6(2) 6-4 | | 1.20 | 11.4% | 5.7% | 50.0% | 77.1% | 62.9% | 2/3 | 1:29 |
| 26‑Jul‑2004 | Canada Masters | Hard | R64 | 25 | 14 | Kiefer d. (15)Marat Safin [RUS] | 6-7(3) 6-4 7-6(2) | | 1.33 | 14.9% | 4.3% | 60.6% | 84.2% | 56.8% | 1/3 | 2:43 |
| 26‑Aug‑2002 | US Open | Hard | R128 | 64 | 2 | (2)Marat Safin [RUS] d. Kiefer | 6-3 4-6 4-6 6-4 7-6(4) | | 0.92 | 5.8% | 6.3% | 51.3% | 72.2% | 41.3% | 14/21 | 4:32 |
| 20‑May‑2002 | Dusseldorf | Clay | RR | 63 | 2 | Kiefer d. Marat Safin [RUS] | 6-4 2-6 7-6(5) | | | | | | | | | |
| 28‑Aug‑2000 | US Open | Hard | QF | 14 | 7 | (6)Marat Safin [RUS] d. (14)Kiefer | 7-5 4-6 7-6(5) 6-3 | (ch) | 0.76 | 7.8% | 4.2% | 51.8% | 75.6% | 45.0% | 17/21 | 3:04 |
| 2‑Apr‑1999 | Davis Cup WG R1: GER vs RUS | Carpet | RR | 26 | 23 | Marat Safin [RUS] d. Kiefer | 7-6(9) 6-4 6-4 | | | | | | | | | |