Katharine Fahey defeated Maria Mateas 6-1 6-2 in the W25 Sumter round of 32 on hard. The upset overturned the form book — Maria Mateas came in leading the head-to-head 1–0. Katharine Fahey claimed a first win over Maria Mateas in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-10-09 | W25 Hilton Head Island | R32 | clay | Maria Mateas | 6-2 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.