Jan Siemerink defeated Luis Herrera 6-4 3-6 6-2 6-3 in the US Open round of 128 on hard. The result followed the form book — Jan Siemerink came in leading the head-to-head 1–0, defending last year's round of 64. Jan Siemerink extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-04-22 | Singapore | R16 | hard | Jan Siemerink | 7-6(2) 7-6(5) |
Averages over each player's completed matches in the selected window (199 vs 8). 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