Umpires and referees are involved in a wide range of sports. The referee is there to impose the rules and ensure that the game is played fairly. Generally the umpires are there to assist the referee in making decisions. Depending on the sport, some umpires have some specific duties.
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They make sure that there is no cheating in a game of tennis. They call the score and have the final decision on everything.
An umpire in tennis calls the lines in our out, calls out foot faults, and mainly observes all the aspects of the game. They also tell the score everytime a serve is administered.
watch for penalty's and see where the ball lands to determine downs and what yard the ball should be placed on.