Alan Mackin defeated German Puentes 6-4 6-0 in the Hungary F4 round of 32 on clay. The upset overturned the form book — German Puentes came in leading the head-to-head 2–0. Alan Mackin claimed a first win over German Puentes in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-02-23 | Spain F4 | R16 | clay | German Puentes | 6-7(1) 6-0 6-2 |
| 2003-10-06 | Croatia F8 | QF | clay | German Puentes | 6-4 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.