Michael Chang defeated Juan Antonio Marin 6-3 6-4 in the Miami Masters round of 128 on hard. The upset overturned the form book — Juan Antonio Marin came in leading the head-to-head 1–0, defending last year's round of 32. Michael Chang claimed a first win over Juan Antonio Marin in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-03-15 | Miami Masters | R128 | hard | Juan Antonio Marin | 7-6(3) 7-6(7) |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (140 vs 82). ATP, WTA & Challenger.