Boston ? Umpire Jerry Layne left the hospital to be checked out by baseball’s doctors Sunday, a day after he was hit in the facemask by a pitch from Pedro Martinez.

Layne was diagnosed with a cervical sprain. He was hospitalized overnight before flying to Arizona for further examination.

Layne was injured in the fourth inning of Saturday night’s game when a rising fastball grazed the top of catcher Jason Varitek’s glove before hitting Layne squarely in the mask in front of his forehead.

Dan Iassogna entered in the bottom of the fifth inning as the second base umpire, and Marvin Hudson went behind the plate.