Pedro Sakamoto defeated Diego Matos 6-0 6-2 in the Brazil F3 round of 32 on clay. The upset overturned the form book — Diego Matos came in leading the head-to-head 2–0, but Pedro Sakamoto had been the form player, winning 1 of their last 5 on clay. Pedro Sakamoto claimed a first win over Diego Matos in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-10-10 | Brazil F34 | R32 | clay | Diego Matos | 4-6 6-4 6-3 |
| 2011-07-18 | Brazil F22 | R32 | clay | Diego Matos | 7-5 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.