4:35pm: An Orioles official told MASN's Roch Kubatko not to get too excited about Marquis. Kubatko says the Orioles are "more likely to sign a pitcher who's coming off injury to an incentive-ladened deal." They're known to have interest in bringing Erik Bedard back, for example.
3:20pm: This week we learned that the Phillies, Mets, and Nationals are in on free agent starter Jason Marquis. Today Ken Rosenthal and Jon Paul Morosi of FOX Sports add two American League clubs to the mix: the Mariners and Orioles. Marquis' positive traits: he can eat innings, and he was third in baseball with a 55.6% groundball rate.
The FOX writers note that the Mariners are in on many free agent starters, including John Lackey, Ben Sheets, Doug Davis, and Jarrod Washburn. This is the first I've heard of the Sheets connection.