Basketball
Under the rules of FIBA (the worldwide governing body for the sport), the NCAA (U.S. college basketball), and NFHS (U.S. high schools), there is one referee in a game of basketball. He is the "head" umpire. The referee has all the jobs of the umpires along with a couple more responsibilities. He is also the one that makes the final decision for most problems and is the one who throws the ball up for the tip off at the start of the match.