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.

Reigning French Open champion Coco Gauff advanced to the third round of the WTA and ATP Miami Open on Friday, rallying to defeat Italy's Elisabetta Cocciaretto 3-6, 6-4, 6-3.