In the United States a sportsbook or a race and sports book (sometimes abbreviated as book) is a place where a gambler can wager on various sports competitions, including golf, football, basketball, baseball, hockey, soccer, horse racing, boxing, and mixed martial arts. The method of betting varies with the sport and the type of game. In the US, the Professional and Amateur Sports Protection Act of 1992 allows only Nevada, Oregon, Montana, and Delaware to legally wager on sports.
Winning bets are paid when the event finishes, or if not finished, when played long enough to become official; otherwise all bets are returned. This policy can cause some confusion since there can be a difference between what the sportsbook considers official and what the sports league consider official. Customers should carefully read the sportsbook rules before placing their bets.
The betting volume at sportsbooks varies throughout the year. Bettors have more interest in certain types of sports and increase the money wagered when those sports are in season. Major sporting events that don't follow a specific schedule, like boxing, can create peaks of activity for the sportsbooks.
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Most of the United States sportsbooks are located in Nevada. Now that many casinos share the same parent company, they offer exactly the same wagering choices and odds, which is a disadvantage to the astute gambler who in the past could do more shopping for better prices.
In 1949, Nevada allowed bookmakers to accept bets on horse racing and professional sports. The first Nevada sportsbooks were called Turf Clubs. They were independent from the casinos and had an informal agreement with the hotels that they would stay out of the casino business as long as the hotels stayed out of the sportsbook business. The sportsbooks had to pay a 10 percent tax so they charged a high vigorish to gamblers, but they still brought enough business to make a profit.
In 1974 the tax was lowered to 2 percent, (it was lowered to 0.25 percent in 1983), and in 1975 Frank Rosenthal, who ran the Stardust Casino, convinced legislators to allow them in the casinos, and soon nearly all of the casinos added them. The turf clubs were no longer able to compete and eventually all closed.
Nevada casino sportsbooks generally feature betting windows; big screen televisions; interactive betting stations; odds boards, usually computerized; papers with different odds for the day; places to sit and watch games and races.
Some casinos use third-party operators for their sportsbooks, such as Cantor Gaming, Leroy's, Lucky's, and Club Cal Neva. In 2011, British bookmaker William Hill agreed to buy the Leroy's, the Lucky's, and the Cal Neva chains, which would give it control of 115 of the state's 183 books.
In 2009, a bill passed to allow sports betting on almost every sport. That year, the NFL, the MLB, the NHL, the NBA, and the NCAA filed a lawsuit against the state of Delaware, claiming their sports books were against federal law. The US Supreme Court ruled that the law partially violated the federal law, and Delaware was only allowed to offer parlays on NFL games. Delaware's three racetrack casinos—Dover Downs, Harrington Raceway & Casino, and Delaware Park Racetrack—have sports books. Each sportsbook has multiple televisions, large tote boards, stations for people to wager. During the 2011 NFL season, the three sports books generated $4.4 million in revenue for the state.
See also 
- Morris, et al. (1976), p. 130
- Carey, Dave (May 24, 2011). "William Hill holds the cards in future of sportsbook technology". Covers.com. Retrieved April 1, 2012.
- Millman, Chad (May 13, 2009). "Delaware Allows Sports Betting". ESPN. Retrieved January 30, 2012.
- Raitz, Maureen (July 4, 2009). "Major U.S. sports leagues file lawsuit to block Delaware sports betting". Sussex Countian (GateHouse Media). Retrieved April 13, 2012.
- Richey, Warren (May 3, 2010). "Supreme Court turns back Delaware bid to expand sports betting". The Christian Science Monitor. Retrieved April 13, 2012.
- "Ready. Set. Bet! Sports Lottery at Delaware Racetracks.". Delaware Lottery. Retrieved April 13, 2012.
- "Delaware Sports Lottery". Delaware Lottery. Retrieved April 30, 2012.
- Morin, Charles; et al. (1976). Gambling in America: Final Report of the Commission on the Review of the National Policy Toward Gambling (Report). Washington, DC: US Government Printing Office.