The Rays optioned Sulser to Triple-A Durham on Sunday, Marc Topkin of the Tampa Bay Times reports.
The right-hander hadn't given up a run in his past six appearances but will still be sent down in favor of Ian Seymour, who can provide a bit more length out of the bullpen. Sulser's 3.09 ERA and 1.20 WHIP through 10 big-league outings this season should be enough for him to get another look with Tampa Bay later this season.