Jairo Diaz spent much of the season at Triple-A Albuquerque, and Scott Oberg and Justin Miller shuttled between Denver and Albuquerque. But if they parlay their work in the dying days of the season into consistency, the 'pen could improve in 2016.
"We've got some young arms that we've gotten a chance to take a look at this last month, and guys have performed well, particularly out of the bullpen," Rockies manager Walt Weiss said late in the season.
The Rockies will need improved consistency from the left side, where Boone Logan has struggled through injuries the first two years of his three-year, $16.