Marat Safin defeated Nicolas Kiefer 7-5 4-6 7-6 6-3 in the US Open quarter-final on hard. The upset overturned the form book — Nicolas Kiefer came in leading the head-to-head 4–2, defending last year's round of 32, but Marat Safin had been the form player, winning 2 of their last 4 on hard. Marat Safin narrowed the head-to-head to 4–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-08-13 | Cincinnati Masters | R64 | hard | Nicolas Kiefer | 6-3 7-6(1) |
| 2005-02-21 | Dubai | R32 | hard | Nicolas Kiefer | 7-6(2) 6-4 |
| 2004-07-26 | Canada Masters | R64 | hard | Nicolas Kiefer | 6-7(3) 6-4 7-6(2) |
| 2002-08-26 | US Open | R128 | hard | Marat Safin | 6-3 4-6 4-6 6-4 7-6(4) |
| 2002-05-20 | Dusseldorf | RR | clay | Nicolas Kiefer | 6-4 2-6 7-6(5) |
| 1999-04-02 | Davis Cup WG R1: GER vs RUS | RR | carpet | Marat Safin | 7-6(9) 6-4 6-4 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (200 vs 200). ATP, WTA & Challenger.