Nance was optioned to Triple-A Jacksonville on Sunday, Christina De Nicola of MLB.com reports.
Nance allowed just a lone earned run while tossing three innings and striking out six batters in the nightcap of Saturday's doubleheader, but he likely would have been unavailable for a couple days after throwing 56 pitchers, so the Marlins decided to send him down and open up a spot for a fresh arm.