Naomi Osaka will face American Danielle Collins for a place in the semi-finals of the Miami Open after the Japanese star beat Alison Riske 6-3, 6,4 on Monday. 

Osaka has responded strongly in Florida, advancing to the quarter-finals after leaving Indian Wells in tears earlier this month after being heckled by a fan. The four-time Grand Slam champion, who received a walkover in the previous round, is yet to drop a set and remains one of the favourites to land the title.