Rafael Nadal may need to stop his habit of jumping around just before walking on court for matches.

Before his round of 16 Wimbledon contest against Gilles Muller, the Spaniard smashed his head into the top of a door, right before he was about to step onto the court. He shook it off and laughed about it with Muller and then headed out.

Not exactly the most graceful of moments for the King of Clay.

While the knock on the head most likely had nothing to do with his loss, it is coincidental that it happened right before a grueling nearly five-hour epic that found Nadal leaving Wimbledon before the second week. Both men put on a show to close out the 6-3, 6-4, 3-6, 4-6, 15-13 marathon.

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Muller will face Marin Cilic in the quarterfinals.

Follow Niko on Twitter: @nikovercelletto