Nicolas Gustavo Kauer defeated Gustavo Guerses 6-3 6-4 in the Brazil F26 round of 32 on clay. The upset overturned the form book — Gustavo Guerses came in leading the head-to-head 2–0. Nicolas Gustavo Kauer claimed a first win over Gustavo Guerses in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-04-15 | Chile F1 | R32 | clay | Gustavo Guerses | 6-3 3-6 7-6(4) |
| 2012-10-29 | Chile 11 | QF | clay | Gustavo Guerses | 6-0 7-6(0) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.