Jameson was called up from Triple-A Reno and will start Thursday against the Padres.

EDGE Analysis

The 24-year-old was previously announced as the starter for Thursday's series opener, and he's now officially been added to the big-league roster. Jameson has a 6.95 ERA, 1.59 WHIP and 109:42 K:BB across 114 innings with Reno this year, and he'll have a tough matchup versus the Friars in his MLB debut.