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Naomi Osaka defeats Petra Kvitova in WTA Finals opener

(CNN)Naomi Osaka got her WTA Finals campaign off to a winning start by defeating Petra Kvitova 7-6 4-6 6-4 in an epic battle that lasted two hours, 39 minutes.It was Osaka's 11th consecutive victory, equaling the longest streak of her career, and she was made to work hard by Kvitova in a seesawing encounter in Shenzhen, China. In a repeat of this year's Australian Open final, when Osaka won the second Grand Slam of her career, the world No. 3 rallied from a break down to win the first set. She then lost the second set having led by a break, but controlled the final set to record her first WTA Finals victory having lost all three of her matches last year in Singapore. READ: Top eight women compete for record $14 million at WTA Finals"I'm no ...