Mariano Albert Ferrando defeated Gregory Zavialoff 6-2 6-1 in the Spain 4 3 round of 16 on clay. The upset overturned the form book — Gregory Zavialoff came in leading the head-to-head 1–0, but Mariano Albert Ferrando had been the form player, winning 4 of their last 7 on clay. Mariano Albert Ferrando claimed a first win over Gregory Zavialoff in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-04-09 | Spain 4 2 | R32 | clay | Gregory Zavialoff | 6-3 2-6 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.