Philipp Mullner defeated Daniel Koellerer 6-2 6-4 in the Jamaica F17 round of 32 on hard. The upset overturned the form book — Daniel Koellerer came in leading the head-to-head 3–0. Philipp Mullner claimed a first win over Daniel Koellerer in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-07-14 | Austria F2 | SF | clay | Daniel Koellerer | 6-3 6-0 |
| 2003-07-07 | Austria F1 | F | clay | Daniel Koellerer | 6-1 6-3 |
| 2002-10-28 | Jamaica F18 | QF | clay | Daniel Koellerer | 7-6(3) 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.