Head to head
2
Hard
0
0
Clay
2
Mariano Zabaleta's wins on the left · Stefan Koubek's on the right · bar lengths share one scale
All meetings (4)
| 2006 | Bucharest | Clay | R32 | Stefan Koubek | 4-6 6-4 6-3 |
| 2003 | Auckland | Hard | QF | Mariano Zabaleta | 6-2 6-1 |
| 2002 | St. Petersburg | Hard | R32 | Mariano Zabaleta | 3-6 6-2 6-4 |
| 1998 | Bournemouth | Clay | R32 | Stefan Koubek | 6-1 5-7 7-6(6) |
Methodology
Head-to-head totals and surface splits exclude walkovers (no match was played), which follows ATP convention — walkover meetings still appear in the match list. The momentum chart plots the running lead across all counted meetings, oldest to newest.