Bradley was tossed for yelling at first-base umpire Todd Tichenor following a questionable call as he stood on second base.
With Chone Figgins at third, catcher Miguel Olivo hit a sharp grounder to Red Sox third baseman Kevin Youkilis. As Figgins danced off the base, Youkilis hesitated, double-pumped and threw late to first. But Tichenor called Olivo out, which brought manager Eric Wedge out for a brief argument.
No sooner had Wedge returned to the dugout, Bradley got heated at second after getting the hook from Davis. He was replaced by Ryan Langerhans.
"I was out there arguing and I guess as I was coming off, he was yelling, too, and they got him," said Wedge.
Bradley was dressed and left the clubhouse when reporters were allowed in after the game.
Bradley has had numerous run-ins with umpires over the course of his career, but this was his first ejection of the season.
What exactly happened with Bradley this time?
"Same thing that's gone on a lot for him, I think," said Red Sox starter John Lackey. "I don't know."
Bradley's double was his first hit since April 19 and raised his average to .200. He'd been hitting .263 on April 18 prior to his lengthy slump.