Ryan Raburn was scratched from the Rockies starting lineup on Tuesday.
No word yet as to a reason for the late switch. Charlie Blackmon entered the lineup in his place and will bat leadoff, while Brandon Barnes shifts over to left field.
Wade LeBlanc will remain in the Mariners starting rotation to start against the Orioles on Friday.
He's taking the place of Nate Karns who is being shifted to the bullpen for the time being. LeBlanc returned to the big league in impressive fashion on Friday, shutting out the Cardinals over six innings of work. He should at least get a few more chances to start until Felix Hernandez is ready to return from the disabled list.
Taijuan Walker (foot) will start against the Orioles on Thursday.
Walker was skipped his last trip through the rotation due to tendinitis in the arch of his right foot. The hard-throwing right-hander will bring a 3.45 ERA, 1.16 WHIP and 70/17 K/BB ratio into that matchup.
Mariners manager Scott Servais announced Tuesday that Nate Karns has been moved to the bullpen.
Karns has struggled in the M's rotation this season, compiling a 4.56 ERA, 1.46 WHIP and 84/38 K/BB ratio across 81 innings. He has terrific stuff, but has gotten into trouble due to an extremely high walk rate (4.2 BB/9) this season. It'll be interesting to see if its a temporary move until he rights the ship, or if the M's believe his future is as a late-inning reliever.
Aledmys Diaz is expected to miss a few games until the swelling above his right eye subsides.
Diaz is with the club and in good spirits after getting struck above the eye by a foul ball during Monday's game against the Royals. He went through the full concussion protocol after Monday's game, with everything coming back negative. Greg Garcia is starting in his place on Tuesday and should continue to see action until Diaz is cleared to return.