Hernan Gumy defeated Jan Siemerink 6-4 6-7 6-3 in the Hamburg round of 64 on clay. The upset overturned the form book — Jan Siemerink came in leading the head-to-head 1–0, defending last year's round of 32. Hernan Gumy claimed a first win over Jan Siemerink in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1996-05-27 | Roland Garros | R128 | clay | Jan Siemerink | 7-6(4) 6-3 6-1 |
Averages over each player's completed matches in the selected window (124 vs 199). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About