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Coaching changes have been frequent on the WTA tour, to say the least. 

Osaka has risen to global stardom in the process of becoming the first No. 1 from Asia.

Simona Halep, meanwhile, will headline for Romania in its tie against France. 

Osaka said, "I’m pretty sure it’s obvious. I’m playing for Japan," but a deadline looms.

The world No. 1 and her new Nike campaign are everywhere from L.A. to Tokyo.

Naomi Osaka isn't the first star to join Team Swoosh after some notable achievements.

As play on the dirt kicks off, a look at who's won and hasn't among the game's best.

The superstar youngster has moved away from her original sponsor, Adidas.

The world No. 1's contract with Adidas ended last year. 

The world No. 1 is appealing to an audience far beyond tennis. 

The Aussie won her biggest singles trophy yet on Saturday, reminding many of an older one.

The first rendition of the Miami Open at the Hard Rock Stadium was a success. 

Players posted about birthdays, nights out, throwbacks and more. 

The Romanian is one win away from the Miami final, and the No. 1 ranking.