Czech tennis player Karolina Muchova defeated Canadian teenager Victoria Mboko to reach her first Miami Open semi-final. The 29-year-old Czech player secured her fifth WTA semi-finals after a close match that lasted an hour and 47 minutes. Muchova will face either American Coco Gauff or Switzerland's Belinda Bencic in the semi-afternoon. This victory marks Muchova's excellent run, reaching the fourth round or better at all five tournaments she has played in.