Juan Martin del Potro defeated David Nalbandian 6-4 6-2 in the Madrid Masters round of 16 on clay. The upset overturned the form book — David Nalbandian came in leading the head-to-head 3–0, defending the title. Juan Martin del Potro claimed a first win over David Nalbandian in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-10-26 | Paris Masters | R16 | hard | David Nalbandian | 6-4 6-0 |
| 2008-10-20 | Basel | SF | hard | David Nalbandian | 6-4 6-4 |
| 2007-10-15 | Madrid Masters | R16 | clay | David Nalbandian | 6-2 6-4 |
Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.