Indian Wells champion Bianca Andreescu staged a remarkable recovery to defeat Irina-Camelia Begu and reach the second round of the Miami Open.
The 18-year-old Canadian became one of the most unexpected champions of recent years when she won the title in the Californian desert, one of the biggest on the WTA Tour, as a wild card on Sunday.
Andreescu has rocketed from outside the top 150 at the start of the year to 24th in the rankings but looked to be suffering an understandable letdown when she trailed Romanian Begu by a set and 5-1.
But Andreescu instead won 12 of the next 15 games to take the match 4-6 7-6 (7/2) 6-2 and extend her winning streak.
She will now face another exciting young player in American Sofia Kenin, who was the last player to beat her in Acapulco at the start of this month.
Venus Williams again struggled with her serve but battled to a 7-5 6-3 victory over qualifier Dalila Jakupovic while 15-year-old Cori Gauff claimed her first WTA Tour victory, beating fellow young American Caty McNally 3-6 6-3 6-4.
Naomi Osaka's older sister Mari was given a wild card but lost 6-2 6-4 to another teenage American, 16-year-old Whitney Osuigwe.
In the second round, third seed Petra Kvitova needed only 69 minutes to defeat Maria Sakkari 6-1 6-4.