In-form Naomi Osaka outlasted Petra Kvitova in a three-set marathon for a drought-breaking victory at the WTA Finals on Sunday. Opening the $14 million round-robin tournament, the first in the southern Chinese city of Shenzhen, the world No.3 regrouped from several lethargic stretches to win 7-6 (7/1), 4-6, 6-4 in two hours and 39 minutes. It was the Japanese…

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