NEW YORK -- Police escorted three fans out of Arthur Ashe Stadium after a fight in the upper stands that caused a short delay in Novak Djokovic's match against Philipp Petzschner at the U.S. Open.

U.S. Tennis Association spokesman Chris Widmaier says it was a "disagreement over verbiage" that took place Thursday night during the first set of the second-round match.

Third-seeded Djokovic and Petzschner stopped playing and looked up into the stands while New York police handcuffed the fans and led them out. Nobody was hurt. It was the kind of scene more common at a baseball or football game than a tennis match.

"It was a hot night in New York," Widmaier said. "Things happen."