Richard, who tied his career-high with 14 victories a year ago, considers himself a work in progress this spring.
"There are still things we're working on," he said. "Getting glove-side more consistently with my fastball, not missing over the plate and getting over top on my changeup. But I'm making strides at it every day, getting a little better."
Richard threw 69 pitches and will likely have three more appearances in Arizona before the team breaks camp after a game in Peoria on March 28.
Before leaving Arizona, Richard would like to make right-handed hitters feel a little more uncomfortable in the box.
"I still have not been able to consistently pitch inside to a right-handed hitter," he said.
Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.