Murphy will undergo an MRI on Sunday after experiencing back spasms, Susan Slusser of the San Francisco Chronicle reports.

EDGE Analysis

It's not believed to be a serious injury, but it's still a concerning development for the veteran catcher, who was limited to 12 games last season due to a knee injury. Murphy is expected to serve as San Francisco's No. 2 catcher this season, but he has played in just 64 contests across the past three campaigns.