Walden has a muscle strain in his throwing shoulder and will be out 6-to-10 weeks, USA Today's Bob Nightengale reports. This is the kind of injury where timetables should be given little credence, but nonetheless, it seems like Walden could bout until around the All-Star break. Seth Maness and Kevin Siegrist will now do their best to take the ball in the eighth inning depending on matchups and get it to Trevor Rosenthal in the ninth.