Felipe Rios defeated Guillermo Rivera Aranguiz 7-5 7-6 in the Chile F8 semi-final on clay. The upset overturned the form book — Guillermo Rivera Aranguiz came in leading the head-to-head 2–0, but Felipe Rios had been the form player, winning 3 of their last 7 on clay. Felipe Rios 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 |
|---|---|---|---|---|---|
| 2012-11-26 | Chile F13 | R32 | clay | Guillermo Rivera Aranguiz | 6-4 1-6 6-3 |
| 2012-05-28 | Chile F6 | R32 | clay | Guillermo Rivera Aranguiz | 5-7 6-4 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.