NEW YORK —

Novak Djokovic thinks he came up with a way to get Serena Williams back on the tennis tour: Dare her to do it. Latest Forecast

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A night after Williams stunned the tennis world by showing up to help induct rival Maria Sharapova into the International Tennis Hall of Fame , Djokovic said he thought that was "a beautiful moment."

Video above: Serena Williams takes to social media to talk postpartum depression

"It was surprising, but a very nice gesture from Serena to be there for Maria," Djokovic said Sunday night after winning his first-round match at the U.S. Open . "They had some really intense rivalries and incredible matches over the years."

Then he turned his thoughts to Williams, she of the 23 Gr

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