Cecil Mamiit defeated Matthew Breen 1-6 6-4 4-6 6-3 6-4 in the Australian Open round of 128 on hard. The result followed the form book — Cecil Mamiit came in leading the head-to-head 1–0, defending last year's round of 128. Cecil Mamiit extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-06-15 | USA F5 | QF | hard | Cecil Mamiit | 3-6 6-4 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.