New Seattle catcher Jesus Montero has been hit in the mask by a foul ball and left his first exhibition game for the Mariners.

Montero homered in the top of the fifth inning against Oakland. But the star prospect was hit by a foul ball off the bat of Josh Donaldson in the bottom of the fifth.

Montero looked dazed and had to be guided from the field. The 22-year-old Venezuelan was Seattle's prize acquisition in the offseason. The Mariners gave up All-Star pitcher Michael Pineda to get Montero.

The Mariners and Athletics opened the major league exhibition season. They play the big league opener on March 28 in Tokyo.