Tigers manager Brad Ausmus said that Nathan looked good while throwing fastballs and sliders during a bullpen session Wednesday, the Detroit News reports. Poor mechanics were blamed for Nathan's struggles last season, as it took the veteran closer several months to lower his arm slot. If Nathan is more comfortable with the adjustments heading into 2015, he may be able to rebound enough to stave off Joakim Soria, Bruce Rondon, and Joba Chamberlain from the ninth-inning role this season.