World number one Naomi Osaka came through a three-set tussle with 141-ranked Yanina Wickmayer to reach the Miami Open third round.
Japanese top seed Osaka, who had a first-round bye, beat the Belgian qualifier 6-0 6-7 (3-7) 6-1.
Osaka, 21, hit 14 aces and saved five of six break points to set up a meeting with Taiwan's Hsieh Su-wei.
"In the second set I got really emotional, so in the third I just tried to shut off my feelings," Osaka said.
"I had to work hard out there."
Osaka failed to defend her title in Indian Wells earlier this month after she was beaten in the fourth round by Belinda Bencic.