With the exception of two of his MLB seasons (2007 & 2008 with Cincinnati), Matt Belisle had a decent career as a Middle Reliever, the best of which were in Colorado.  Belisle would leas the National League in Games Played in 2012 and had a 10-4 record the year before.  The year before that he had a 2.93 ERA and a 1.087 WHIP, which were the best of his career.  Belisle overall apperaed in 392 Games for Colorado with an impressive 3.97 SO/BB.

After a cup of coffee with the St. Louis Cardinals, the Colorado Rockies chose Adam Ottavino off of waivers, and he would eventually become one of the better Relief Pitchers in franchise history.

Ottavino spent his first three years with Colorado in their bullpen, proving his worth to the point where there was talk of moving him to the team's closer.  He was poised to take that stop in 2015, but Tommy John Surgery took him out of the game for most of 2015, and he returned in a set-up capacity, while having sub-3 ERA years in 2016 and 2018.  Ottavino signed with the Yankees in 2019, and with Colorado, he appeared in 361 Games, and had 17 Saves.

Used as a starting pitcher for the first six years of his career with the Philadelphia Phillies, Bruce Ruffin came out of the bullpen for the last five years of his career, which was spent with the Rockies.  Ruffin would have varying roles for Colorado and would be used as a closer, securing 60 Saves for Colorado.

Curt Leskanic was a workhorse Middle Relief Pitcher for the Colorado Rockies in the 90’s and would appear in over 60 Games four times in Colorado.  The first time he did that (1995) he would lead the National League in that statistic.  He would be in position often to close games for Colorado and would net 20 Saves over his career for the Rockies.