The US Open was supposed to be a slam dunk for Novak Djokovic but instead of moving closer to Roger Federer in the Grand Slam record books, the world No. 1 was defaulted Sunday when he struck a line judge with a ball.

The Serb had just been broken to trail 6-5 in the first set against Spain’s Pablo Carreno Busta when he hit a ball behind him on the court. Djokovic wouldn’t have been aiming at anyone but it hit the line judge — seemingly near the face — and she fell to the ground.

The chair umpire, Aurelie Tourte, and Djokovic, went to check on her before they were joined on court by tournament referee Soeren Friemel and supervisor Andreas Egli.

Djokovic then had an extended conversation with Friemel before he was officially defaulted. He left the tournament site without speaking to the media.

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