It was announced today that Alfredo Aceves, out since May 12 with a bulging disk in his back, will make a rehab appearance in Trenton on Friday against Harrisburg. Before the injury, Aceves, 27, was 3-0 with a 3.00 ERA in 10 appearances.

Aceves, who was signed in February 2008 in the same deal that brought Manny Banuelos into the organization, went 2-2 with a 1.80 ERA over seven starts -- including a complete-game shutout -- later that year. He debuted with the Yankees on August 31, 2008.

Add Aceves to Jason Jones and Orlando Hernandez, both of whom are on the Senators' roster, and you've got the recipe for a very interesting weekend set at Waterfront Park.