Myers will start Sunday's game against the Cubs, Laura Albanese of Newsday reports.
David Peterson was originally set to start, but he's struggled mightily across his last three outings and will be pushed back in the Mets' pitching schedule. Meanwhile, Myers has made six appearances in relief this season, but Sunday will mark his first start. While Myers has worked as a starter for long stretches of his big-league career, he hasn't covered more than three innings or 39 pitches in an outing this season, so it's unclear how deep he may be able to pitch in Sunday's game.