Giants ace Madison Bumgarner suffered a broken fifth metacarpal on the outside of his pitching hand after being hit by a line drive in Friday's spring training game against the Royals in Scottsdale, Arizona.

Making his final tuneup before his scheduled Opening Day start, Bumgarner was struck by a hard shot off the bat of the Royals' Whit Merrifield in the third inning.

Afterward, Bumgarner said he'll have pins inserted in the hand Saturday to help the injury heal. A source told ESPN's Buster Olney that the left-hander will be sidelined six to eight weeks.