Mark Merklein defeated Donavan September 6-1 4-6 7-6 in the USA 2 Masters 4 round of 64 on hard. The result followed the form book — Mark Merklein came in leading the head-to-head 2–0. Mark Merklein extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-04-03 | USA F8 | R32 | hard | Mark Merklein | 6-3 6-2 |
| 1996-06-14 | USA 3 Masters 1 | R16 | hard | Mark Merklein | 6-2 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.