Bass is the favorite to open the season as the Marlins' primary closer, Jordan McPherson of The Miami Herald reports.
The right-hander has done nothing to pitch himself out of the job this spring, posting 2.16 ERA and 8:3 K:BB in 8.1 Grapefruit League innings. Bass saved 12 games over the last two seasons for the Mariners and Blue Jays, a mark he could easily exceed even if he winds up splitting ninth-inning work with Yimi Garcia.