Guaipe was optioned to Triple-A Tacoma on Tuesday.
With Joaquin Benoit returning from the disabled list Tuesday, the Mariners' bullpen was at capacity, making Guaipe a logical candidate to be sent back down to the minors. Guaipe appeared in five games with the Mariners during his most recent stint, working a 4.91 ERA with five strikeouts and four walks across 7.1 innings. If the Mariners suffer another injury in the bullpen, Guaipe would certainly be a candidate to be called back up to the big leagues.