"There was pressure, but I felt fine with it because I've been in the back end of the bullpen my whole Minor League career," Butler said. "I just wanted to go in there and give our guys a chance to get in there and get the win."
Butler debuted with a one-hit, one-walk, one-strikeout inning on Saturday and pitched a perfect ninth Sunday. He made the jump from Double-A Springfield to the Majors last Friday and has impressed manager Mike Matheny.
"We saw him in Spring Training, we knew he would have some effectiveness against the righties," Matheny said. "But then to see him also have success in the Minor Leagues [and the Majors] against the left-handers ... makes him even more usable for us."
Butler, a righty, has faced nine left-handers and six right-handers in his three appearances. The only hit he has allowed was against Giants left-hander Brandon Crawford.
Chad Thornburg is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.