Juan Carlos Saez defeated Juan Sebastian Vivanco 6-1 6-0 in the Belgium F4 round of 32 on clay. The upset overturned the form book — Juan Sebastian Vivanco came in leading the head-to-head 3–2, 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 3–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2012-10-08 | Chile F8 | R32 | clay | Juan Carlos Saez | 6-2 6-0 |
| 2012-02-20 | Chile F3 | R32 | clay | Juan Carlos Saez | 6-3 3-6 6-3 |
| 2011-11-07 | Chile F12 | R32 | clay | Juan Sebastian Vivanco | 6-3 6-4 |
| 2011-10-03 | Chile F7 | R32 | clay | Juan Sebastian Vivanco | 7-5 6-1 |
| 2009-10-12 | Chile F2 | R32 | clay | Juan Sebastian Vivanco | 7-6(7) 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.