Rafael Serpa Guinazu defeated Diego Junqueira 4-6 7-5 6-0 in the Argentina F8 round of 16 on clay. The upset overturned the form book — Diego Junqueira came in leading the head-to-head 1–0. Rafael Serpa Guinazu claimed a first win over Diego Junqueira in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-09-04 | Peru F2 | R16 | clay | Diego Junqueira | 6-4 5-7 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.