Madison Appel defeated Mary Closs 6-3 6-7 10-7 in the W15 Cancun 2 q16 on hard. The upset overturned the form book — Mary Closs came in leading the head-to-head 1–0. Madison Appel claimed a first win over Mary Closs in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-11-05 | W15 Cancun 23 | R32 | hard | Mary Closs | 7-6(3) 7-6(4) |