Novak Djokovic dropped a bombshell about fellow tennis icon Serena Williams after advancing to the second round of the US Open. It’s been three years since Williams ended her career at her home Grand Slam tournament, and Djokovic wants to see her back on the circuit.

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. 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.”

A pro tennis star just 'challenged' Serena Williams to come back from her unofficial retirement and get back in the game.