Feliciano Lopez defeated Juan Martin del Potro 4-6 7-6 7-6 6-3 in the Davis Cup WG F: ARG vs ESP round robin on hard. The upset overturned the form book — Juan Martin del Potro came in leading the head-to-head 5–2. Feliciano Lopez narrowed the head-to-head to 5–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-07-02 | Wimbledon | R64 | grass | Juan Martin del Potro | 6-4 6-1 6-2 |
| 2013-08-11 | Cincinnati Masters | R16 | hard | Juan Martin del Potro | 6-4 1-6 6-4 |
| 2011-01-10 | Sydney | R32 | hard | Juan Martin del Potro | 6-7(5) 7-6(9) 7-6(3) |
| 2010-10-04 | Tokyo | R32 | hard | Feliciano Lopez | 6-3 6-0 |
| 2008-03-27 | Miami Masters | R64 | hard | Feliciano Lopez | 6-4 6-2 |
| 2007-10-28 | Paris Masters | R64 | hard | Juan Martin del Potro | 6-4 6-3 |
| 2007-02-19 | Memphis | R32 | hard | Juan Martin del Potro | 6-1 6-2 |
Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.