For a long time, this spot seemed like a lock for Rex Brothers. He wore 49 the longest out of any Rockie and he was a homegrown reliever who looked like the natural successor to Huston Street as the Rockies closer. Instead, he had one bad season in 2014 and he was gone after the 2015 season after not making many appearances.
This spot could go to Antonio Senzatela eventually. He was named National League Rookie of the Month to start the 2017 season. He went 9-3 with a 4.68 ERA before going to the bullpen to monitor his innings. He pitched well out of the bullpen in 2018 but struggled back in the rotation in 2019.
This spot deservingly goes to Jose Jimenez who, at one point, had the most saves in franchise history (102) until Brian Fuentes passed his record. Jimenez became a staple in the Rockies bullpen from 2000-2003. In 2002, he set a then-franchise record with 41 saves with a 3.56 ERA.
The next year he started and did not have nearly the success he did in relief. Regardless though, he is one of the best arms in franchise history.
Some notable players that wore 50 include Jamie Moyer, who became the oldest player ever to ever earn a win at the age of 49. Julian Tavarez won nine games in a row with two complete games to earn a career high in wins with 11. Chi Chi Gonzalez wears the number currently.