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After dropping serve early in the second set, third seed Osaka threw her racket, slammed a ball into the court and gave her racket a kick for good measure before steadying the ship and earning a 6-2, 6-4 win over Zheng Saisai.
Parents normally tell their teenagers to watch their language, but Coco Gauff turned the tables on her father during her second round clash with Laura Siegemund at the Auckland Classic.
Jil Teichmann, who won both of her two WTA titles at clay court tournaments last year, defeated American Shelby Rogers in the other semifinal.
Gauff will face rising Tunisian star Ons Jabeur for a place in the semifinals of the Top Seed Open.
Former women's world No. 1 Halep suffered a shocki defeat at the hands of American qualifier Taylor Townsend.
Results 31-35
