Juan Martin del Potro defeated Daniel Koellerer 6-1 3-6 6-3 6-3 in the US Open round of 32 on hard. The result followed the form book — Juan Martin del Potro came in leading the head-to-head 1–0, defending last year's quarter-final. Juan Martin del Potro extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-08-25 | US Open | Q32 | hard | Juan Martin del Potro | 6-3 6-2 |
Averages over each player's completed matches in the selected window (200 vs 39). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About