Carlos Castellanos defeated Juan Giner 6-1 7-6 in the Spain 4 4 round of 16 on clay. The upset overturned the form book — Juan Giner came in leading the head-to-head 2–0. Carlos Castellanos claimed a first win over Juan Giner in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-01-29 | Spain 2 Masters 1 | R16 | clay | Juan Giner | 6-4 6-0 |
| 1998-08-03 | Spain F5 | QF | clay | Juan Giner | 6-3 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.