File this under: “HEADACHE.”

During the first set of Saturday’s Australian Open men’s doubles final, Nicolas Mahut thumped his partner Pierre-Hugues Herbert in the noggin with this serve.

It is their first tournament as a team, so maybe that will serve as an excuse for Mahut?

Herbert shook it off and was fine for the rest of the match, but the French duo fell to the Italian pairing of Fabio Fognini and Simone Bolelli, 6-4, 6-4.