Head to head
1
Hard
2
0
Clay
1
Guillermo Garcia-Lopez's wins on the left · John Isner's on the right · bar lengths share one scale
All meetings (4)
| 2019 | US Open | Hard | R128 | John Isner | 6-3 6-4 6-4 |
| 2013 | Madrid Masters | Clay | R64 | John Isner | 7-5 7-6(8) |
| 2010 | Auckland | Hard | R32 | John Isner | 4-6 7-6(3) 6-2 |
| 2008 | San Jose | Hard | QF | Guillermo Garcia-Lopez | 7-6(4) 6-7(1) 7-6(11) |
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.