Tennis legend Serena Williams invested in women's 3-on-3 basketball league Unrivaled, bringing the its value up to $340 million, the league announced Monday.

Unrivaled is now valued at $340 million as the league gains Serena Williams as its newest investor.

Tennis legend Serena Williams invested in women's 3-on-3 basketball league Unrivaled, bringing the its value up to $340 million, the league announced Monday.