Rockies right-hander Jon Gray puts focus on changeup in spring training debut against Mariners

SCOTTSDALE, ARIZONA – FEBRUARY 20: Jon Gray (55) throws live batting practice during spring training for the Colorado Rockies at Salt River Field at Talking Stick on February 20, 2020 in Scottsdale, Arizona. (Photo by RJ Sangosti/The Denver Post)PEORIA, Ariz. — Jon Gray put an emphasis on his changeup in his first start of spring training when he allowed one run across two innings against Seattle on Monday.

The Rockies right-hander leaned mostly on his fastball/changeup combination, throwing only a few curveballs and a couple sliders.

“That (pitch mix) was different, but it was a good opportunity to get those other pitches better,” Gray said. “The first start always feels weird — you feel…