Billy Beane announced Wednesday it would be Tyson Ross who took Bartolo Colon's place in the rotation, and the A's made it official, promoting him from Triple-A Thursday morning.
NEWS: Colon suspended
Ross will take the mound in the series opener against the Tampa Bay Rays at 4 p.m.
It marks the fourth time Ross, 25, has joined the big league club. He is 2-8 with a 6.35 ERA in 12 starts with the team.
Ross is 5-2 with a 2.74 ERA in 13 starts for the Sacramento River Cats this year.