Oscar Rodriguez Arg defeated Carlos Custodio 6-1 6-2 in the Brazil 4 Masters 2 semi-final on clay. The upset overturned the form book — Carlos Custodio came in leading the head-to-head 1–0, but Oscar Rodriguez Arg had been the form player, winning 3 of their last 8 on clay. Oscar Rodriguez Arg claimed a first win over Carlos Custodio in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-10-25 | Brazil 4 Masters 4 | R16 | clay | Carlos Custodio | 6-2 6-4 |