Roe, 26, had 4 saves, 2.00 ERA (2 ER in 9.0 IP) and held opponents to a .194 average (6-for-31) with 2 walks and 13 strikeouts in 9 games for the Aces. This will be his first stint in the Majors, and he will wear No. 34. Roe signed with the D-backs as a Minor League free agent on Sept. 15, 2012, after spending the 2012 season with the independent Laredo Lemurs, going 3-2 with 1.47 ERA (9 ER in 55.0 IP) in 49 relief appearances. He spent the 2005-10 seasons in the Colorado Rockies system and 2011 in the Seattle Mariners system.
Cahill, 25, is 3-10 with a 4.66 ERA (50 ER in 96.2 IP) in 17 starts this season, but has had a particularly horrific June, going 0-5 in six starts, with a 9.85 ERA last month. He did have to leave his appearance early on June 19th - the only start this month he didn't lose - after being hit on the the hip by a come-backer, and that appears to be the
excuse explanation being used for today's move. However, as the five starts prior to that incident saw Cahill put up an ERA of almost seven, I don't think we can blame all of this recent struggles on his injury, unless Cahill is also auditioning for Doctor Who.
It seems likely that this is a short-term measure, designed to give the bullpen an extra arm for any mop-up work over the next four days, until Cahill's spot in the rotation comes up again. When that does, I imagine we will probably see Roe sent back down and, I suspect, the return of Tyler Skaggs to the roster.