Abbott is scheduled to start Tuesday against the Mets, Mark Zuckerman of MASNSports.com reports.
The 26-year-old was recalled by Washington on Saturday and will join the rotation with Erick Fedde (shoulder) recently placed on the injured list. Abbott's two big-league appearances this year have come out of the bullpen, but he's started six games for Triple-A Rochester and has a 5.08 ERA, 1.67 WHIP and 34:17 K:BB over 28.1 innings.