DETROIT -- Seattle and Detroit will continue a four-game series on Tuesday night with each club seeking to work out problems with their rotations.

The Tigers have a reliable starter going in Justin Verlander (7-5), who has a 2.31 ERA in his last eight outings.

Detroit has also been getting solid outings from Wednesday night's starter, rookie Michael Fulmer, along with veteran Jordan Zimmerman.

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The other two slots have been a season-long problem.

Mike Pelfrey was roughed up again Monday night, giving up 12 hits and a walk in five innings, and the other spot comes up Thursday -- with manager Brad Ausmus professing not to know who will fill the slot.

Ausmus will get no tears from Mariners skipper Scott Servais, though. Seattle will have three regular starters down with injuries if it gets bad news from Taijuan Walker's MRI.

Walker, limited to 3 1/3 innings and five shutout innings in his last two outings, went back to Seattle after his Sunday start in Boston to have the tendon along the right arch in his right root examined.

The Mariners might have to bring up right-hander Zach Lee, just acquired Sunday from the Los Angeles Dodgers.

Mariners starters Wade Miley and Felix Hernandez are already on the disabled list. One replacement, Adrian Sampson, will start Thursday in Detroit.

"It's tough," Servais said. "We will get Wade back pretty soon, so that helps. Felix is feeling better. He had a good report (Monday), so he's moving in the right direction.

"It's just disappointing and disheartening, especially if Taijuan is going to be down for any amount of time."

Detroit's problems also extend to its bullpen, which has been ground down by having to cover for starters not being able to get into the sixth at least twice every time through the rotation.

One of the biggest problems is that our bullpen is not getting a break," Ausmus said. "(Shane) Greene has thrown five out of eight days, I think. We've got to get him a break somehow."

The problem also is that Greene, Justin Wilson and Francisco Rodriguez are the only relievers who have regularly pitched well.

"Win three lose four, win five lose six, that simply isn't going to cut it. We gotta play better, simple as that."