Pedro Sakamoto defeated Diego Matos 6-0 6-2 in the Brazil F3 round of 32 on clay. The upset overturned the form book — Diego Matos came in leading the head-to-head 2–0, but Pedro Sakamoto had been the form player, winning 4 of their last 5 on clay. Pedro Sakamoto claimed a first win over Diego Matos in three meetings, narrowing the head-to-head to 2–1.
Sakamoto P. took it in straight sets.
Pedro Sakamoto beat Diego Matos 6-0 6-2. Umpiry, "Pedro Sakamoto vs Diego Matos — Brazil F3 Round of 32", https://umpiry.com/match/2018-05-07/matos-vs-sakamoto-brazil-f3-r32?utm_source=cite (as of 7 May 2018).