The Marlins have outrighted infielder Yadiel Rivera and righty Brett Graves, according to Wells Dusenbury of the Sun-Sentinel (via Twitter). That creates two 40-man roster openings in advance of the Rule 5 draft.
Rivera, 26, got his first extended look at the MLB level last year, but managed only a .173/.269/.216 batting line in 160 plate appearances. Graves, meanwhile, received his first major-league stint with the Fish in 2018. He threw 33 1/3 innings of 5.40 ERA ball with 5.7 K/9 and 3.2 BB/9.