Lars Koslowski defeated Jan Weinzierl 6-3 6-4 in the Spain 1 Masters 4 round of 16 on clay. The upset overturned the form book — Jan Weinzierl came in leading the head-to-head 1–0. Lars Koslowski claimed a first win over Jan Weinzierl in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1996-01-05 | Spain 1 Masters 1 | R32 | clay | Jan Weinzierl | 2-6 7-6 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.