Vladimir Voltchkov defeated Nicolas Kiefer 6-2 6-1 in the Doha quarter-final on hard. The upset overturned the form book — Nicolas Kiefer came in defending last year's semi-final. Vladimir Voltchkov extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-08-16 | Athens Olympics | R64 | hard | Nicolas Kiefer | 6-2 6-4 |
| 2002-10-21 | St. Petersburg | QF | carpet | Vladimir Voltchkov | 7-5 7-5 |
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 (83 vs 200). ATP, WTA & Challenger.