The former world No. 11 gave birth to her first child, daughter Alexandra, last year, and has been given a wildcard to the last WTA 125 event of the year.

"I thought it was pretty dangerous," said one player about the conditions. With a series of high-profile injuries, the endangered playing surface was the topic of discussion at its venerable home.

Reigning US and Australian Open champion Naomi Osaka won a 23rd straight match at the Miami Open on Monday, keeping her shot at usurping Ashleigh Barty atop the WTA rankings alive. Top seeds Aryna Sabalenka and Elina Svitolina also advanced.