World No.1 Naomi Osaka is through to the third round of the Miami Open after struggling to overcome battling qualifier Yanina Wickmayer.
The top seed hit 14 aces and overcame a ragged stretch in the second set, becoming so frustrated she threw her racket, to win 6-0 6-7(3) 6-1 to reach round three for the first time since her 2016 debut.
"The scoreline doesn't really reflect how dramatic it was for me," the Miami-raised Osaka admitted after her win against her Belgian opponent.
"It was really hard for me ... I think, emotionally in the second set, because I just started thinking about winning, not exactly the things I could do in order to win."
The tournament has moved this year from Key Biscayne to the Miami Dolphins' stadium complex, where Osaka took part in the ribbon-cutting ceremony.
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Eight-time champion Serena Williams, meanwhile, won her opening match by beating Swede Rebecca Peterson 6-3 1-6 6-1.
Williams played poorly for a stretch and was broken three times but steadied her game in the final set to pull away. She avoided a repeat of last year, when she was eliminated in her first match by Osaka.
Sister and three-time champion Venus Williams also overcame a wobbly start to beat No. 24 Carla Suarez Navarro 7-6(4) 6-1.
Canadian 18-year-old Bianca Andreescu, who overcame a match point to win her opening match, reached the third round by beating Sofia Kenin 6-3 6-3. Andreescu won her first career title last week at Indian Wells.
Dane Caroline Wozniacki cruised past Aliaksandra Sasnovich 6-4 6-4, while German Angelique Kerber defeated Karolina Muchova 3-6 6-3 6-3 and Sloane Stephens and Simona Halep won at a canter.
Australian Ajla Tomljanovic, meanwhile, also won through to the third round with a 6-3 6-4 win over Aryna Sabalenka of Belarus.
