Seattle Mariners relief pitcher Erik Swanson (groin) is heading to the 10-day injured list. The 27-year-old recorded his first save of the year on Friday against the Rangers, so the timing isn't good. Swanson has a 0.69 ERA and 14 strikeouts throughout 13 innings of work this season. Fantasy managers hoping to capitalize on a potentially enhanced role with the club are sorely disappointed.