Sergio Galdos defeated Guillermo Rivera Aranguiz 6-3 6-7 6-3 in the Chile F3 round of 16 on clay. The upset overturned the form book — Guillermo Rivera Aranguiz came in leading the head-to-head 2–0. Sergio Galdos 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 |
|---|---|---|---|---|---|
| 2012-08-27 | Ecuador F3 | QF | clay | Guillermo Rivera Aranguiz | 6-3 6-4 |
| 2008-09-22 | Bolivia F3 | R32 | clay | Guillermo Rivera Aranguiz | 6-3 6-4 |
Averages over each player's completed matches in the selected window (30 vs 35). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About