Maria Sharapova has entered the International Tennis Hall of Fame, with Serena Williams introducing her at the ceremony on Saturday night.

But the weekend stars shined a little brighter than expected when Serena Williams made a surprise appearance at the historic venue off Bellevue Avenue on Aug. 23. After years of battling each other on the court, Sharapova and Williams found the essence of one another.

Williams' surprise appearance to induct Sharapova was "months in the making" and required the code name of another female icon.