Sebastian Decoud defeated Jonathan Gonzalia 7-5 2-6 6-4 in the Argentina F2 round of 16 on clay. The upset overturned the form book — Jonathan Gonzalia came in leading the head-to-head 2–0. Sebastian Decoud claimed a first win over Jonathan Gonzalia in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-11-17 | Uruguay F2 | R32 | clay | Jonathan Gonzalia | 4-6 6-4 6-4 |
| 2003-07-14 | Ecuador F2 | R32 | clay | Jonathan Gonzalia | 7-6(6) 5-7 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.