Fields was optioned to Triple-A Oklahoma City on Saturday.
Fields was brought up to fill the bullpen vacancy of the injured Grant Dayton, but was sent back down upon the latter's return. Nonetheless, it was a solid stint for the right-hander, as he allowed just one earned run over five relief appearances and racked up six strikeouts. Look for Fields to be in line for a future callup in the event of another bullpen opening.