Travis, the Toronto Blue Jays second baseman, lost control of his bat while swinging at a pitch from Boston reliever Steven Wright.
The bat cleared the netting along the baseline and landed about 15 rows up in the box seats, about midway between third base and home plate. Security scrambled for towels and a stretcher was brought to take the man.
The man received a big cheer from the crowd when he stood up. Holding a towel to his head in his right hand, he pumped his left fist to acknowledge the applause. He walked to the stretcher and sat on it and was wheeled away.
The Associated Press contributed to this report.