Ivan Lendl defeated Jan Siemerink 6-4 6-2 in the Basel round of 32 on hard. The upset overturned the form book — Jan Siemerink came in leading the head-to-head 1–0, but Ivan Lendl had been the form player, winning 3 of their last 5 on hard. Ivan Lendl claimed a first win over Jan Siemerink in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1993-09-27 | Basel | R32 | hard | Jan Siemerink | 7-5 7-6(5) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.