Federico Sansonetti defeated Guillermo Rivera Aranguiz 6-2 6-2 in the Chile F3 round of 32 on clay. The upset overturned the form book — Guillermo Rivera Aranguiz came in leading the head-to-head 2–0. Federico Sansonetti claimed a first win over Guillermo Rivera Aranguiz in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-04-20 | Argentina F2 | R16 | clay | Guillermo Rivera Aranguiz | 6-3 4-6 6-4 |
| 2009-02-02 | Colombia F1 | R16 | clay | Guillermo Rivera Aranguiz | 6-2 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.