Lionel Noviski defeated Ricardo Schlachter 6-3 7-6 in the Argentina 3 round of 16 on clay. The upset overturned the form book — Ricardo Schlachter came in leading the head-to-head 1–0, but Lionel Noviski had been the form player, winning 5 of their last 8 on clay. Lionel Noviski claimed a first win over Ricardo Schlachter in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-04-28 | Argentina 2 | R32 | clay | Ricardo Schlachter | 6-1 6-2 |