Seattle Mariners v Baltimore OriolesNick Vincent #50 of the Seattle Mariners pitches against the Baltimore Orioles during the sixth inning on May 19, 2016 in Baltimore, Maryland. (Photo by Maddie Meyer/Getty Images)

by Curtis Crabtree
KJR reporter
Twitter: @Curtis_Crabtree

SAFECO FIELD - The Seattle Mariners placed right-handed pitcher Nick Vincent on the 15-day disabled list with a back strain and activated Wade Miley ahead of Wednesday night's start against the Pittsburgh Pirates.

Miley (6-3, 5.28 ERA) missed the last two weeks due to an impingement in his left shoulder. He pitched four innings and struck out seven in a rehab start with Single-A Everett last Friday.

Vincent said his back became an issue after an outing in Tampa Bay where he pitched 2 2/3 innings on June 15.

"After that is when it locked up and just hasn't unreleased from that," Vincent said. "It's something that's still nagging from two weeks ago. I tried pitching through it and obviously it's not working so we're going to give it 15 days and be ready to go after the All-Star break, probably."

Vincent has struggled since. In five appearances, he's allowed four runs and three home runs with a loss, a blown save and a 6.75 ERA.

"It's a combination of being overused and the back," manager Scott Servais said of Vincent. We've tried to give him a day here, a day there, we just haven't had many chances to give him two or three days off and he just hasn't been able to get over the hump with the back issue."

In 30 appearances prior to the back injury surfacing, Vincent had pitched 31 innings with a 2.90 ERA with just seven walks and 37 strikeouts.

"I want to go out there and help the team as much as I can, but I'm not helping the team right now at all," Vincent said.

"What I'm doing right now is not helping the team. This team is really good and it makes me sick that I've lost three or four f------ games. It makes me sick when I know this team is this good and we've got a good chance of doing something."

Nathan Karns on move to bullpen:

Manager Scott Servais revealed on Tuesday that the Mariners are moving right-handed pitcher Nathan Karns into the bullpen with Wade LeBlanc replacing him in the starting rotation.

Karns has struggled in June. He's failed to pitch more than five innings in all five of his starts and allowed at least four runs in three of the five outings.

"I can't be disappointed," Karns said. "I put myself in that situation. I've always been told 'if you don't like it, play better.' That's kind of where I'm at. I'm just going to sit here and do whatever they ask of me and try to do the best of my ability."

Karns said he's only worked out of the bullpen once in his life, so it will be an adjustment.

"I had another opportunity to stay in this locker room and help contribute to wins and provide any ability to help contribute to a win was more than I can ask for," Karns said.

Servais said he wants to get Karns' feet wet out of the bullpen as soon as possible.

"I do think we need to get him out there as quick as possible," Servais said. "I think he's anxious to get out there and do something to help the team as well."