Luis David Martinez defeated Jonathan Chang 7-5 6-4 in the Canada F4 round of 32 on hard.
Martinez L. took it in straight sets.
Luis David Martinez beat Jonathan Chang 7-5 6-4. Umpiry, "Luis David Martinez vs Jonathan Chang — Canada F4 Round of 32", https://umpiry.com/match/2017-07-03/chang-vs-martinez-canada-f4-r32?utm_source=cite (as of 3 July 2017).