10:40am: Larry Stone of the Seattle Times tweets that the Mariners will also get a player to be named later, and it could be a "pretty significant name." The Tigers may make one more trade before tomorrow, tweets Jon Paul Morosi.
10:03am: The Tigers acquired Fister, tweets SI's Jon Heyman.
9:05am: Lefty Charlie Furbush is among the players expected to go to Seattle in a Fister trade, tweets Danny Knobler of CBS Sports. The Tigers are trying to get a reliever other than Brandon League as well.
Fister, 27, has a 3.33 ERA, 5.5 K/9, 2.0 BB/9, 0.43 HR/9, and 46.4% groundball rate in 146 innings this year. His walk rate ranks seventh in the AL, his innings total tenth. His 6.95 innings per start average is a welcome contrast from the Tigers' non-Verlander starters, who all average around six. Drafted in the seventh round in 2006, Fister never cracked a Baseball America top 30 Mariners prospect list, but he's become a solid mid-rotation innings eater. He's under team control through 2015 and won't be arbitration eligible until after next season.