Pedro Sakamoto defeated Nicolas Alvarez 6-3 7-6 in the M15 Naples 1 quarter-final on clay. The upset overturned the form book — Nicolas Alvarez came in leading the head-to-head 1–0, but Pedro Sakamoto had been the form player, winning 7 of their last 8 on clay. Pedro Sakamoto claimed a first win over Nicolas Alvarez in two meetings, levelling the head-to-head at 1–1.
Sakamoto P. took it in straight sets.
Pedro Sakamoto beat Nicolas Alvarez 6-3 7-6(10). Umpiry, "Pedro Sakamoto vs Nicolas Alvarez — M15 Naples 1 Quarter-final", https://umpiry.com/match/2019-01-18/alvarez-vs-sakamoto-m15-naples-1-qf?utm_source=cite (as of 18 January 2019).