He struggled with his second rehab start Thursday, giving up four runs in 2 1/3 innings. Hellickson's first rehab start was at Class A Advanced Charlotte, in which he threw three scoreless innings.
He was 12-10 with a 5.17 ERA for the Rays in 2013.
Mike Vernon is an associate reporter from MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.