Mariners rookie Brandon Maurer took the hill for his final tune-up of the spring Saturday against the Rockies.

Maurer gave up two solo home runs in the fourth inning. He was charged with two runs and five hits in six innings. He also struck out three and walked one as he finished spring training 3-1 with a 1.50 ERA.

"I was a little uncomfortable and only my slider was working out there today," Maurer said.

The right-hander is expected to open the season Thursday against the A's.