Cornelio will serve as the Nationals' opening pitcher for Sunday's game against the Angels, Kyle Williams of TheBanner.com reports.
Cornelio will draw his second start of the season after firing three scoreless innings as an opener his last time out Tuesday in San Diego. The right-handed rookie has regularly worked multiple frames for the Nationals, throwing at least 30 pitches in 10 of his 13 big-league appearances. Jake Irvin -- Sunday's originally scheduled starter -- could be an option to follow in bulk relief, though the Nationals haven't revealed their pitching plans beyond Cornelio's starting assignment.