"Obviously, he's one of the guys we've got to get going," Wedge said. "So we're giving him a day. It'll be a chance for him to have a good workday and then we'll go from there."
Veteran infielder Robert Andino got the start in Ackley's place. Ackley has started eight of the first 10 games, but has just a .182 on-base percentage and has yet to have an extra-base hit.
The Rangers are coming with four straight right-handed starters in the series, but Wedge said that didn't factor into his decision to pick Thursday to sit.
"It's just what I feel like he needs, quite frankly," Wedge said. "And I want to continue to get Robert in there. He's been ramping up better in regard to his at-bats. He's worked hard this spring to be a more consistent player. I think he deserves to play."
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB as well as his Mariners Musings blog. This story was not subject to the approval of Major League Baseball or its clubs.