Kelvin Herrera played his entire career coming out of the bullpen, a career that began in the Majors with Kansas City in 2011.  

The Dominican came into his own in the middle of the decade, becoming Kansas City’s set-up man in 2014, and helping his team get into the World Series that year.  An All-Star in both 2014 and 2015, Herrera was again outstanding in his role in 2015, with the Royals returning to the World Series, though with a different result, with KC winning it all.

Herrera would later become Kansas City's closer, but as they faltered, Herrera was traded to Washington during the 2018 Season.  His sat with the Nationals was brief as he signed with the White Sox in 2019, but he struggled badly and was out of Baseball after the 2020 Season.