The A's are in Oakland for a four-game set with the rival Mariners.
Manager Bob Melvin has issued his lineup for Game 1 of the series.
The Oakland A’s acquired right-handed pitcher Cody Martin from the Atlanta Braves for international bonus slot 53 and assigned him to Triple-A Nashville, the club announced on Thursday.
The Giants anticipate better days ahead for Matt Cain. Day 1, they hope, was just about knocking the rust off.
The first day back went a lot better for Jose Fernandez than it did for Matt Cain.