ARLINGTON, Texas — Texas Rangers opening day starter Matt Harrison is going on the disabled list after trying to pitch with soreness in his lower back.

The Rangers said Wednesday that Harrison will be put on the 15-day DL after an MRI revealed an inflamed nerve in his back. The left-hander will remain in Texas for treatment instead of going with the team to Seattle, where he was scheduled to start Thursday night.

“It’s about trying to get Harry right. We can’t have him going out there and he’s having issues,” manager Ron Washington said. “We’re going to get those issues taken care of by giving him time down, get it right, and when he comes back, we’ve got him for the rest of the year.”

Harrison (0-2, 8.44 ERA) has been dealing with stiffness in his back causing weakness in his left leg since late in spring training.

Red Sox

Drew activateD; Lackey on DL: In Boston, the Red Sox placed right-hander John Lackey on the 15-day disabled list and activated shortstop Stephen Drew.

In another move Wednesday, they called up right-hander Alex Wilson from Pawtucket. On Tuesday, they optioned shortstop Jose Iglesias to the Triple-A team.

Lackey strained his right biceps against the Toronto Blue Jays on Saturday in his first start since major elbow surgery sidelined him all of last season. He was placed on the disabled list retroactive to Sunday. Drew was activated from the seven-day concussion disabled list.

Reds

Marshall on DL with tendinitis: The Cincinnati Reds placed left-hander Sean Marshall, who’s been bothered for several weeks by left shoulder tendinitis, on the 15-day disabled list.

The move was made retroactive to Monday, and right-hander Logan Ondrusek was recalled from Double-A Pensacola and was expected to arrive in time for Wednesday’s game against the Cardinals.

Marshall has appeared in one game, working a scoreless inning.

Mariners

Saunders leaves game with sprained shoulder: In Seattle, Mariners right fielder Michael Saunders has sprained his right shoulder crashing into the outfield wall to make a catch. He will be re-examined Thursday. The team said he is expected to miss some time.

Saunders chased a fly in a full sprint across the warning track and caught it just as he collided with the wall. He fell to the ground holding his right shoulder. Saunders then walked to the dugout holding his right arm close to his ribs.

Saunders was batting .286 with a seven-game hitting streak.