Mikhail Kukushkin defeated Juan Martin del Potro 7-6 7-6 in the Sydney quarter-final on hard. The upset overturned the form book — Juan Martin del Potro came in leading the head-to-head 1–0, defending the title. Mikhail Kukushkin 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 |
|---|---|---|---|---|---|
| 2011-07-07 | Davis Cup WG QF: ARG vs KAZ | RR | clay | Juan Martin del Potro | 6-2 6-1 6-2 |
Averages over each player's completed matches in the selected window (198 vs 174). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About