Head to head
3
Hard
0
1
Clay
3
Nicolas Massu's wins on the left · Gaston Gaudio's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (7)
| 2006 | Madrid Masters | Hard | R64 | Nicolas Massu | 4-6 6-3 RET |
| 2005 | Gstaad | Clay | SF | Gaston Gaudio | 6-3 6-2 |
| 2004 | Kitzbuhel | Clay | F | Nicolas Massu | 7-6(3) 6-4 |
| 2003 | US Open | Hard | R128 | Nicolas Massu | 6-3 6-3 6-2 |
| 2003 | Miami Masters | Hard | R64 | Nicolas Massu | 6-4 5-7 6-3 |
| 2003 | Vina del Mar | Clay | R32 | Gaston Gaudio | 6-0 2-6 6-1 |
| 2002 | Kitzbuhel | Clay | QF | Gaston Gaudio | 6-4 6-3 |
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.