The Tigers designated Watson for assignment Wednesday.
Detroit added Watson to its 40-man roster July 19, but he remained at Triple-A Toledo and didn't wind up making any appearances for the big club before getting DFA'd to clear room for Corey Julks, whose contract was selected from Triple-A. While handling a swingman role at Toledo this season, Watson has submitted a 3.27 ERA, 1.09 WHIP and 38:18 K:BB over 55 innings.