The 24-year-old flashed the makings of a future closer in his first season with the Rockies.
When he was acquired from the Los Angeles Angels in a trade for Josh Rutledge last December, Colorado Rockies reliever Jairo Diaz came with a reputation of having a big-time fastball but not much ability to command it.
In his first season with the Rockies, Diaz began to get the fastball under control and started to mold himself into more of a pitcher than a thrower.
Among the youngest relievers in the Rockies bullpen at age 24, Diaz made his Colorado debut on August 23 against the Mets, pitching a scoreless inning with a walk and a strikeout.