Borut Puc defeated Guillermo Rivera Aranguiz 7-6 1-6 6-3 in the Chile F4 qualifying round on clay. The upset overturned the form book — Guillermo Rivera Aranguiz came in leading the head-to-head 1–0, but Borut Puc had been the form player, winning 4 of their last 10 on clay. Borut Puc 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 |
|---|---|---|---|---|---|
| 2009-11-23 | Peru F1 | R32 | clay | Guillermo Rivera Aranguiz | 6-0 2-6 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.