Written byRajdeep Saha
Women's singles world number one Naomi Osaka was stunned by a determined Hsieh Su-Wei in the third round of the Miami Open.
This was a second tourney in a row where Osaka failed to go the distance.
Serena Williams' injury concerns forced her to withdraw.
Meanwhile, Roger Federer battled past Radu Albot.
Osaka took the first set 6-4, but then lost the momentum losing 6-7 and 3-6 in the next.
The Japanese had faced an issue in the second set against Yanina Wickmayer in the previous round as well.
The 33-year-old Hseih hit 39 winners and seized the opportunity to come out on top.
"This was a very emotional win for me," said Hsieh.
Serena was forced to withdraw from her third round match against Wang Qiang. A knee injury cut short her campaign in Miami. "I am disappointed to withdraw from the Miami Open due to a left knee injury," said Williams.
Kvitova rallied on to beat Donna Vekic 6-4, 3-6, 6-4.
Wozniacki overcame qualifier Monica Niculescu 6-4, 7-6.
The two stars were joined by Bianca Andreescu.
The Canadian had won the Indian Wells title last week and this time she beat Angelique Kerber 6-4, 4-6, 6-1 to notch her 10th successive win.
Swiss maestro Federer battled back from a set down to seal a 4-6, 7-5, 6-3 victory against 46th-ranked Radu Albot in the second round.
Federer took time to settle down at the Hard Rock Stadium, but his experience came into play as the match progressed.
The win helped him set a meeting with Serbian Filip Krajinovic next.
Krajinovic surprised Stan Wawrinka 5-7, 6-2, 7-6.
"I definitely think Radu played a great match, it was really tough and I struggled early on. I am very relieved and happy to make it through. It was a great atmosphere," said Federer after his victory.
The veteran Ferrer, who is on a farewell tour in 2019, won the tie 2-6, 7-5, 6-3 in two hours and 22 minutes.
Sixth seed Kevin Anderson beat Jaume Munar 6-4, 3-6, 6-3.
Grigor Dimitrov thrashed Feliciano Lopez 6-1, 6-3 to progress.
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