Williams and Sharapova traded jabs and laughter in their speeches like close friends would and shared a long embrace at the conclusion of Williams’ remarks. Williams even jokingly called for security twice to escort Sharapova, whom Williams called a “heckler,” out of the ceremony.

When Sharapova was inducted into the Tennis Hall of Fame on Saturday night, her former on-court antagonist provided the introduction. For many tennis watchers, Williams’s top secret cameo was shocking,