Guillermo Rivera Aranguiz defeated Alex Theiler 6-3 6-1 in the Chile F4 round of 16 on clay. The result followed the form book — Guillermo Rivera Aranguiz came in leading the head-to-head 5–0. Guillermo Rivera Aranguiz extended the head-to-head to 6–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-11-14 | Chile F13 | R32 | clay | Guillermo Rivera Aranguiz | 6-2 6-3 |
| 2011-08-29 | Colombia F5 | R32 | clay | Guillermo Rivera Aranguiz | 6-2 6-2 |
| 2010-12-13 | Chile F9 | R16 | clay | Guillermo Rivera Aranguiz | 4-6 7-5 7-6(3) |
| 2010-10-25 | Chile F2 | R32 | clay | Guillermo Rivera Aranguiz | 6-0 6-1 |
| 2009-10-12 | Chile F2 | R32 | clay | Guillermo Rivera Aranguiz | 6-0 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.