Maria Sharapova, Venus Williams among stars who honor science achievement at Breakthrough Prize Ceremony

Juan Martin del Potro is apt to buy into a joke during a match, even when there's a lot on the line. During Del Potro's quarterfinal Miami Open match against Milos Raonic, the Canadian smashed a tight shot that could have been called either way.

Del Potro wasn't entirely sure the ball was in, so he pretended to be a line judge to see for himself. It got a laugh from the crowd.

The world No. 6 won the match in a third-set tiebreak for his 15th straight win. He will face John Isner in the semifinals, and is two matches away from completing the Sunshine Double.

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