"Funny thing is, when I was warming up, I felt like I'd never thrown a baseball before and I wouldn't get an out today," Hammel said, smiling. "But good changeup today. The game plan was to work on that more. It wasn't very good last time out.
"Pretty pleased with all my pitches, right up to the last pitch, but even that was a good pitch."
Hammel went 4 1/3 innings, gave up five hits, walked none and struck out five. He threw 67 pitches, 44 for strikes.
"Sometimes you never know what you're going to bring out there until you get out there," Hammel said. "First time working with Drew [Butera] behind the dish and that went well. He called a great game and I feel pretty good with the two catchers we got."
Hammel knows his changeup will be a critical part of his arsenal this season.
"We discussed earlier to work on the changeup more to righties and lefties," he said. "It's going to be a weapon this year, especially the way they stack lefties in the American League. Going to need that."
Jeffrey Flanagan has covered the Royals since 1991, and for MLB.com since 2015. Follow him on Twitter @FlannyMLB. This story was not subject to the approval of Major League Baseball or its clubs.