Hernan Gumy defeated Juan Antonio Marin 6-3 0-6 4-6 6-2 6-1 in the US Open round of 128 on hard. The upset overturned the form book — Juan Antonio Marin came in leading the head-to-head 3–0, defending last year's round of 128. Hernan Gumy claimed a first win over Juan Antonio Marin in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-07-17 | Umag | R32 | clay | Juan Antonio Marin | 5-7 6-2 6-4 |
| 1999-08-09 | San Marino | QF | clay | Juan Antonio Marin | 4-6 6-3 6-2 |
| 1998-06-08 | Bologna | R16 | clay | Juan Antonio Marin | 6-4 6-2 |
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 (75 vs 169). ATP, WTA & Challenger.