Cueto (biceps) allowed four runs on seven hits over 3.2 innings in a rehab start for Double-A Pensacola on Friday.
He threw 42 of his 62 pitches for strikes, and all four runs came via a first-inning grand slam by the unheralded Cade Bunnell. Cueto likely will need at least one more rehab start before he's able to return to the Miami staff, but he could be making starts for the Marlins by the end of June.