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

Sharapova was honored with an official U.S. Open ring Sunday at Arthur Ashe Stadium, following her induction into the International Tennis Hall of Fame. She accepted her latest hardware in the latest rendition of the tennis dress that changed the sport. “New York City, what a special place and special court,” Sharapova said.

Serena Williams and Maria Sharapova are friends now? The shocking Hall of Fame induction has fans reeling over forgiveness and the intense media narratives that once defined their rivalry. Get the full story.