Jack Sock defeated Juan Martin del Potro 6-4 7-6 in the Madrid Masters round of 32 on clay. The upset overturned the form book — Juan Martin del Potro came in leading the head-to-head 1–0. Jack Sock claimed a first win over Juan Martin del Potro in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-10-17 | Stockholm | F | hard | Juan Martin del Potro | 7-5 6-1 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (199 vs 170). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About