Gaston Giussani defeated Guillermo Rivera Aranguiz 2-6 6-4 6-1 in the Chile F4 round of 32 on clay. The upset overturned the form book — Guillermo Rivera Aranguiz came in leading the head-to-head 1–0. Gaston Giussani claimed a first win over Guillermo Rivera Aranguiz in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-10-18 | Chile F1 | QF | clay | Guillermo Rivera Aranguiz | 6-1 6-7(3) 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.