A list of all players who have ever played Relief pitcher for the Kansas City Royals, with photos of the players when available. These Kansas City Royals Relief pitchers are listed by popularity, so the top of this list features only the best Kansas City Royals Relief pitchers of all time. The Kansas City Royals have a rich history with the MLB, and they owe a lot of their success to their talented Relief pitchers. This list answers the question, "Who are the greatest Kansas City Royals Relief pitchers of all time?"List items range from Bo Jackson to Carlos Beltrán.