Marquez will start Tuesday against the Nationals, BSN Denver's Drew Creasman reports.
Marquez is currently in Colorado preparing for his start, but look for the official roster move to take place Tuesday. The right-hander is taking the rotation spot of Jon Gray (foot) and will be making his first MLB start of the season. Marquez has posted a 2.70 ERA and struck out 18 while walking no one over 10 innings at Triple-A Albuquerque to open the season. The 22-year-old uses a heavy sinker to complement his fastball and changeup, and he has a curveball too.