Juan Carlos Saez defeated Guillermo Rivera Aranguiz 6-4 6-3 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 4–3, but Juan Carlos Saez had been the form player, winning 6 of their last 10 on clay. Juan Carlos Saez narrowed the head-to-head to 4–4.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-05-30 | Argentina F9 | SF | clay | Juan Carlos Saez | 6-4 6-3 |
| 2016-05-23 | Argentina F8 | R32 | clay | Juan Carlos Saez | 6-1 6-1 |
| 2014-11-24 | Chile F8 | SF | clay | Guillermo Rivera Aranguiz | 5-7 6-4 6-4 |
| 2012-06-04 | Chile F7 | SF | clay | Guillermo Rivera Aranguiz | 6-4 6-3 |
| 2012-05-21 | Chile F5 | QF | clay | Juan Carlos Saez | 6-3 7-5 |
| 2010-12-06 | Chile F8 | R32 | clay | Guillermo Rivera Aranguiz | 6-3 6-2 |
| 2009-10-05 | Chile F1 | QF | clay | Guillermo Rivera Aranguiz | 6-0 6-3 |
Averages over each player's completed matches in the selected window (30 vs 15). 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