Walden got the save Sunday night against the Reds because Trevor Rosenthal was being rested. Walden allowed one single and had one strikeout in the course of converting the save. Rosenthal had pitched in five of the previous seven games, so manager Mike Matheny predetermined that Rosenthal would get the night off. Walden has had closing experience before and had been pitching the eighth inning earlier this season, so it's no surprise that he got the nod.