Joao Souza defeated Leonardo Mayer 6-4 3-6 6-3 in the Sao Paulo quarter-final on clay. The upset overturned the form book — Leonardo Mayer came in leading the head-to-head 2–0, defending last year's round of 32, but Joao Souza had been the form player, winning 3 of their last 7 on clay. Joao Souza claimed a first win over Leonardo Mayer in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-05-29 | Roland Garros | Q1 | clay | Leonardo Mayer | 6-2 6-1 |
| 2015-03-06 | Davis Cup WG R1: ARG vs BRA | RR | clay | Leonardo Mayer | 7-6(4) 7-6(5) 5-7 5-7 15-13 |
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 (200 vs 200). ATP, WTA & Challenger.