Alan Mackin defeated Marko Tkalec 7-6 5-7 7-6 in the Umag q32 on clay. The upset overturned the form book — Marko Tkalec came in leading the head-to-head 1–0. Alan Mackin claimed a first win over Marko Tkalec in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-05-29 | Italy F4 | R16 | clay | Marko Tkalec | 4-6 6-3 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.