Harris struck out Todd Frazier swinging on a curveball in the dirt, and the D-backs scored four times in the bottom of the inning, leaving the right-hander as the pitcher of record for Arizona in the club's 11-5 victory.
"No wins are actually easy, but I'm sure it was my shortest outing ever to get a win," Harris said, laughing.
The win marked Harris' second in the Major Leagues, his first coming last year when he tossed two clean innings against the Brewers as a member of the Rockies.
The D-backs have used Harris in different scenarios since his team debut May 10, but the 28-year-old has managed to stay mentally prepared throughout games by looking ahead to see when he might be called upon.
"You can pretty much look at their lineup and know if I'm going to get in early, like this is probably the group that I'm going to be facing," Harris said. "I was prepared before the game that if I was going to go in, I'd probably see Frazier. So you can kind of have an idea based on how you're used in the past."