With runners on second and third and Mitch Moreland at the plate, Jewell uncorked a wild pitch. He raced to the plate to cover and appeared to slip before getting there, with his right ankle getting caught beneath him.
The right-hander remained down on the ground for several minutes before a stretcher was wheeled out to home plate. He was taken to a local hospital.
"He's getting evaluated, I think, at Massachusetts General,'' Angels manager Mike Scioscia said. "Hopefully we'll get an idea of what's happening sometime tonight."
The Martinez run counted, giving Boston a 9-6 lead that would hold as the final score.
Jewell had just been recalled from Triple-A Salt Lake City before the game.
The Associated Press contributed to this report.
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