German Puentes defeated Alan Mackin 6-4 7-5 in the Croatia F8 qualifying round on clay. The upset overturned the form book — Alan Mackin came in leading the head-to-head 1–0. German Puentes claimed a first win over Alan Mackin in two meetings, levelling the head-to-head at 1–1.
Puentes G. took it in straight sets.
German Puentes beat Alan Mackin 6-4 7-5. Umpiry, "German Puentes vs Alan Mackin — Croatia F8 Qualifying Round", https://umpiry.com/match/2003-10-06/mackin-vs-puentes-croatia-f8-qf?utm_source=cite (as of 6 October 2003).