The D-backs made their first roster move of the spring when they assigned right-hander Reid Mahon to Minor League minicamp on Tuesday.
Bob Melvin announced the move on Wednesday. Mahon, a reliever who had a 3.07 ERA in 33 games for Double-A Mobile last year before earning a promotion to Triple-A Tucson, struggled mightily with his command during his bullpen sessions.
“Just had some mechanical issues he needs to deal with,” Melvin said.
Mahon had been scheduled to pitch in a “B” game on March 4, but now will not.