The game was delayed for four minutes in the eighth inning when an 18-year-old fan, Scott Harper of Armonk, N.Y., plummeted about 40 feet from the upper deck onto the netting behind home plate.
"That was the only exciting thing that happened today," Yankees owner George Steinbrenner said.
After the final out, Harper was carried from the ballpark on a stretcher, his head immobilized in a neck brace, and taken to Lincoln Hospital for observation.
Harper told three friends he was sitting with that he was going to test whether the net would hold his weight -- and then he jumped, police said.
Obviously shaken after he landed, Harper sat with his head in his hands for a few moments before climbing on the net back up to the loge level as players watched and the crowd roared. He was hoisted over the railing and led away by security.
Det. Kevin Czartoryski said Harper was arrested and police expect to charge him with reckless endangerment, criminal mischief, criminal trespass and disorderly conduct.
"I've never seen anything like that before," Chicago manager Ozzie Guillen said. "I think that's New York, you know, anything can happen."