Parker (2-2) took the loss in the second game of Tuesday's doubleheader against the White Sox, giving up three runs on five hits and two walks over five-plus innings. He struck out three.

Parker will start the second game of Tuesday's doubleheader against the White Sox.

Parker is slated to start Sunday's game against the Astros at Nationals Park, Mark Zuckerman of MASNSports.com reports.

The Nationals recalled Parker from Triple-A Rochester on Monday, Andrew Golden of The Washington Post reports.

Parker is expected to be called up from Triple-A Rochester and make his major-league debut Monday versus the Dodgers, Andrew Golden of The Washington Post reports.

The Nationals optioned Parker to Triple-A Rochester on Monday.

The Nationals selected Parker's contract from Triple-A Rochester on Tuesday, Andrew Golden of The Washington Post reports.