Parker is expected to be called up from Triple-A Rochester to start Monday's game versus the Dodgers in Los Angeles, Andrew Golden of The Washington Post reports.
Parker will toe the rubber against a loaded Dodgers lineup, joining the major-league roster after tossing four scoreless innings while striking out five batters in his only start at Triple-A this season. The 24-year-old was selected in the fifth round of the 2020 MLB Draft, and he's geared up to make his debut less than four years later.