Brandon Belt and Buster Posey each singled in the fifth, but Butler worked Hunter Pence into a line-drive double play. After a spotless sixth that ended with a strikeout of Hector Sanchez, the Giants loaded the bases on a walk, a single and a hit batsman, but Butler escaped the inning by getting a groundball force out that plated a run and a line drive.
Butler, 22, a supplemental first-round pick in 2012 out of Radford University, posted a 1.80 ERA at two Class A levels and Double A last season. It was the second lowest ERA in all the Minors. This spring, Butler has a 3.86 ERA in three appearances totaling six innings. Butler and 2013 first-round pick Jon Gray, a righty from Oklahoma, have signaled that they are not far from the Majors, although it's not clear if they'll stay in camp or be sent to Minor League camp to increase their innings.
"He kept it together," Rockies manager Walt Weiss said. "He got some balls elevated and they got barreled, but the thing I like is he's got that heavy sinker that's going to get him out of it more times than not. He kept his cool, it didn't get fast on him and he made some pitches."
Thomas Harding is a reporter for MLB.com. Follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.