Jansen blew the save in Tuesday's 7-5 loss to the Diamondbacks, allowing a run on a hit while striking out one in one-third of an inning.
The veteran right-hander was called upon to preserve the Tigers' one-run lead with runners on the corners and two outs in the eighth inning, but he instead served up a three-run homer to rookie Jose Fernandez. Jansen punched out the next batter he faced to end the frame, but the damage was done. The 38-year-old is now 1-for-2 in save chances to begin the year, and Tuesday's outing isn't likely to affect his job security as Detroit's closer, barring additional struggles.