Head to head
3
Hard
1
1
Clay
0
1
Grass
0
Gilles Simon's wins on the left · Donald Young's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (6)
| 2015 | US Open | Hard | R128 | Donald Young | 2-6 4-6 6-4 6-4 6-4 |
| 2014 | Acapulco | Hard | R16 | Gilles Simon | 6-4 6-3 |
| 2012 | Rome Masters | Clay | R64 | Gilles Simon | 6-2 7-5 |
| 2010 | US Open | Hard | R128 | Gilles Simon | 6-1 6-4 6-2 |
| 2008 | Canada Masters | Hard | R64 | Gilles Simon | 6-1 6-3 |
| 2008 | Nottingham | Grass | R32 | Gilles Simon | 6-1 6-4 |
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.