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

Though Williams and Sharapova were rivals both on and off the court throughout their storied careers, they have unexpectedly emerged as friends since retiring. With their relationship now a friendship, Williams not only surprised Sharapova by attending her Hall of Fame induction, but gave a touching speech in her honor.

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.