In the midst of a big comeback season where he established himself again as an impact closer, it appears as though the St. Louis Cardinals' Trevor Rosenthal may be headed to the DL due to what the team is calling a bout of arm tightness. The words "tight" and "arm" should not go hand-in-hand for any pitcher and so this is something that is not a small deal by any means and could threaten the remainder of the season for Rosenthal depending on what they find. Rosenthal set off alarms during a rough appearance on Wednesday when his velocity shot way down and he complained afterwards of the tightness. That means Seung Hwan Oh should get another chance to close and salvage what has been a very disappointing season for the March highly touted stopper. With an ugly 1.33 WHIP and a high for a closer 3.46 ERA, Oh has struggled this season after dominating as rookie in 2016 when he looked to be one of the best closers in fantasy baseball. While his original owners likely cut bait by now, pick up Oh where available.