Pedro Sakamoto defeated Juan Manuel Valverde 3-6 7-6 7-5 in the Argentina F1 round of 32 on clay. The upset overturned the form book — Juan Manuel Valverde came in leading the head-to-head 1–0. Pedro Sakamoto claimed a first win over Juan Manuel Valverde in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-09-19 | Brazil F31 | R32 | clay | Juan Manuel Valverde | 4-6 6-2 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.