Chris Letcher defeated Luis David Martinez 6-1 5-7 6-3 in the Mexico F1 round of 16 on hard. The upset overturned the form book — Luis David Martinez came in leading the head-to-head 1–0. Chris Letcher claimed a first win over Luis David Martinez in two meetings, levelling the head-to-head at 1–1.
Letcher C. came through in three sets.
Hard: Letcher C. leads 1–0 · Clay: Martinez L. leads 1–0
Chris Letcher beat Luis David Martinez 6-1 5-7 6-3. Umpiry, "Chris Letcher vs Luis David Martinez — Mexico F1 Round of 16", https://umpiry.com/match/2014-04-21/letcher-vs-martinez-mexico-f1-r16?utm_source=cite (as of 21 April 2014).