With May almost over the Mariners have had like 22 pitchers in the bullpen and it wouldn’t surprise me if it doubles that before the season ends or even by the all-star break. A lot of that depends on how many relievers end up having success for the Mariners.
Brandon Brennan so far looks like the best acquisition the Mariners have in the bullpen since the beginning of the year. The amazing thing he was a rule 5 pickup. He along with Roenis Elias and Cory Gearrin are the only relievers who started the season with Seattle.