Watch: Haase penalized after hilariously mocking opponent's grunt

If you've ever been annoyed by a tennis player grunting on television, imagine what it must be like to be on the court with them.

While taking on Gonzalo Lama at the Postejov Challenger in the Czech Republic, Robin Haase became so frustrated by his opponent's grunting that he fired back with a loud grunt of his own.

The chair umpire failed to see the humor in the situation and called a "hinderance" penalty on Haase, giving Lama a point. Haase went on to lose the match 6-3, 6-3.