World number two Jannik Sinner made a smooth start Saturday at the Miami Open, where defending champion Jakub Mensik shook off a "horrible" first set to win his opening match.Andreeva, 18, and 19-year-old Mboko have split their last two matches, Andreeva winning in the final at Adelaide in January before Mboko sent her packing in the third round at Doha -- saving a match point in the three-set win and going on to reach the final.
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