Kentaro Masuda defeated Carlos Martinez Comet 4-6 6-4 6-1 in the Spain F9 round of 16 on clay. The upset overturned the form book — Carlos Martinez Comet came in leading the head-to-head 1–0. Kentaro Masuda claimed a first win over Carlos Martinez Comet in two meetings, levelling the head-to-head at 1–1.
Masuda K. came through in three sets.
Kentaro Masuda beat Carlos Martinez Comet 4-6 6-4 6-1. Umpiry, "Kentaro Masuda vs Carlos Martinez Comet — Spain F9 Round of 16", https://umpiry.com/match/1999-09-06/comet-vs-masuda-spain-f9-r16?utm_source=cite (as of 6 September 1999).