Urena will begin the season in the Marlins bullpen, Joe Frisaro of MLB.com reports.
The 25-year-old right-hander was competing with southpaw Adam Conley for the final rotation spot, but Urena failed to make a good enough impression this spring to overcome Conley's past success in the big leagues. Urena's value will be limited as a long reliever given his modest strikeout numbers, but he could be a streaming option if he picks up any spot starts throughout the season.