Joao Zwetsch defeated Francisco Costa 6-4 6-4 in the Brazil 1 Masters 1 qualifying round on clay. The upset overturned the form book — Francisco Costa came in leading the head-to-head 3–0. Joao Zwetsch claimed a first win over Francisco Costa in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-10-25 | Brazil 4 Masters 3 | QF | clay | Francisco Costa | 6-1 7-6 |
| 1996-10-19 | Brazil 4 Masters 2 | SF | clay | Francisco Costa | 6-3 7-5 |
| 1996-10-19 | Brazil 4 Masters 4 | R32 | clay | Francisco Costa | 3-6 6-3 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.