Bart De Gier defeated Michael Lammer 6-3 6-3 in the Switzerland 1 2 round of 16 on carpet. The upset overturned the form book — Michael Lammer came in leading the head-to-head 2–0. Bart De Gier claimed a first win over Michael Lammer in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-02-10 | Switzerland 1 3 | R32 | carpet | Michael Lammer | 6-2 6-4 |
| 2003-02-10 | Switzerland 1 4 | QF | carpet | Michael Lammer | 7-6(7) 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.