Four starts into his return from Tommy John surgery, Shelby Miller has been placed on the 10-day disabled list by the Arizona Diamondbacks due to inflammation in his right elbow.

Miller turned in his shortest outing of the season Wednesday, lasting just one inning in a 19-2 loss at the Colorado Rockies. Miller surrendered five runs on four hits with two walks and a strikeout, tossing 37 pitches including 22 for strikes, before exiting with stiffness in his arm.

Diamondbacks manager Torey Lovullo told the Arizona Republic after Wednesday's game that Miller already was en route back to Phoenix, where he would undergo tests on his right arm. The Diamondbacks termed the injury “right elbow tightness.”

Catcher Alex Avila said of Miller's latest outing, “He definitely didn’t seem himself. He was kind of struggling to command really anything. I was noticing him grimacing on occasion when he’d throw a pitch. Obviously there was something wrong there.”

Miller took the loss as his 2018 record dipped to 0-4 in four starts with a 11.40 ERA over 15 innings. Miller has struck out 19, walked seven and yielded 24 hits and 21 runs.