NEWPORT, R.I.— Serena Williams made a a surprise — and early — appearance at the International Tennis Hall of Fame, emerging from behind the stage to introduce “former rival, former fan and forever friend” Maria Sharapova for her induction on Saturday night. Williams, a 23-time Grand Slam champion who will be eligible for her own enshrinement in 2027, drew gasps and shrieks from the crowd at the Newport shrine.

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