Yu Darvish was pulled by the Rangers after five innings on Sunday because of lower back discomfort. Darvish, who improved to 7-2 with a 12-6 win over the Blue Jays, allowed seven hits and three runs before leaving. "You know he came up with a stiff back and it could've been some of the reason he was erratic," Rangers manager Ron Washington said. "I didn't find out about it until after the fifth inning was over and he was in the dugout. "He stood out there and gave us five. If he didn't have the stiff back he would've went out for the sixth. At some point I felt he was going to have a quick inning. We weren't taking a chance once he said his back was stiff, so we took him out."