According to the New York Daily News, a brawl broke out among spectators Thursday night in section 187 as Novak Djokovic and Philipp Petzschner played nearby. Both participants -- a woman and a man -- were reportedly taken away by police.
Meanwhile, on the court, Djokovic secured a victory. Scroll down for video of the altercation.
UPDATE, here's another video, via SportsByBrooks: