Marquez will begin the season as one of the Rockies' long relievers, Thomas Harding of MLB.com reports.
The Rockies opted to place right-hander Antonio Senzatela and left-hander Kyle Freeland in the rotation to begin the year, leaving Marquez to fill a relief role. Marquez had some struggles during spring training, but his first appearances in the major leagues last season provide some hope that he'll be able to right the ship fairly quickly. If either Senzatela or Freeland struggles out of the gate, Marquez could be the next one up for a rotation spot.