Ronan Joncour defeated Brandon Walkin 6-4 7-6 in the M15 Cancun 19 round of 16 on hard. The upset overturned the form book — Brandon Walkin came in leading the head-to-head 1–0. Ronan Joncour claimed a first win over Brandon Walkin in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-07-23 | M15 Cancun 17 | R32 | hard | Brandon Walkin | 6-2 3-6 6-0 |