Troy Renck of the Denver Post tweets that the Rockies are in pursuit of free agent pitchers, including left-handed reliever Sean Marshall. Marshall appeared in only 16 games last season due to a shoulder injury. When he has been healthy, he has quietly been one of baseball's more effective relievers, posting a 2.44 ERA over the past four seasons, averaging better than a strikeout per inning and more than four strikeouts for every one walk.