A Diamond Judge, also known as an UMP (3 letters) or UMPIRE (6 letters), is a person who officiates in the sport of baseball. They are responsible for making decisions on the field such as calling balls and strikes, determining whether a batted ball is fair or foul, and ruling on plays involving the baserunners. The Diamond Judge is also responsible for enforcing the rules of the game and ensuring that the players adhere to them.