Hall of Famer cites simple reason for split with former world No. 1. 

Keep up ith the action from today's men's singles semifnals at the Miami Open with the Live Blog, sponsored by Tecnifibre.

Two months after announcing an official arrangement, the pair have elected to split, leaving Sam Sumyk as Muguruza's only coach.

Victoria Azarenka, Alexander Zverev, Sloane Stephens and More. Follow WTA semifinal and ATP quarterfinal action with the Tecnifibre Miami Open Day 10 Live Blog.

Keep up with all the action from Day 9 of the Miamio Open, as Juan Martin del Potro seeks to win his 15th straight and Venus Williams bids for her 65th career win at Miami.

Juan Martin del Potro aims to follow in Gustavo Kuerten's footsteps as a South American No. 1.

Former world No. 1 hits the practice court.