Brandon Walkin defeated Ronan Joncour 6-2 3-6 6-0 in the M15 Cancun 17 round of 32 on hard. The upset overturned the form book — Ronan Joncour came in leading the head-to-head 1–0. Brandon Walkin claimed a first win over Ronan Joncour in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-08-15 | M15 Cancun 19 | R16 | hard | Ronan Joncour | 6-4 7-6(4) |