McGrath was optioned to Triple-A El Paso on Tuesday.
EDGE Analysis
After spending most of his season with Double-A San Antonio, McGrath's demotion will be his first action with Triple-A El Paso this year after pitching 6.2 innings during his most recent stint in the majors. Still, the promotion from Double-A is deserved after he struck out 27 in 23.2 innings earlier this season with an ERA of 2.66 and WHIP of 0.86 out of the bullpen for San Antonio.