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With the exception of casual bets between friends over sports matches, sports betting is usually carried out with the help of a bookie. Legal bookmakers exist all around the world and, in areas where sports betting is illegal, players commonly make their sports bets on the Internet with an online bookmaker. There are many price-per-head bookmaking websites that will take wagers on all sporting events in the world.

The general role of the bookmaker is to act as a market maker for sports bets, most of which have only two possible outcomes: a team either wins or loses. The bookmaker takes wagers for both possible outcomes and maintains a point spread, which will ensure a profit for the bookie regardless of the outcome of the wager. Bookmakers handle different types of bets all of which ensure they get their profit while paying out the winner of the wager. The following are just some of the most common bet types used by bookmakers.

Preposition bet: A preposition bet is when a player bets on a very specific outcome of a match instead of just a win condition. For example, placing a wager on the number of goals a soccer team will score on a given match, betting on a specific player scoring a goal, or wagering on the total yardage a wide receiver in a football game will net.

Parlay: A group of wagers that can go up to the dozen and that have a larger payout for the bettor than if he had made the individual bets, provided that the bettor wins all bets in the parley. A variant often called “progressive parlay” exists in which some of the bets can lose and a reduced payout is made.

Teaser: In a teaser, the bettor combines his bets on multiple games, adjusting the point spreads for each game but having a lower payout in the event of a win.

Run line: Also called goal lines in soccer, run lines are variant wagers with a fixed spread that usually offers a higher payout to the bettor in case the favorite team wins and a lower payout in case the home dog wins.

Future bet: We call “future bets” wagers made in the long-term, for games that will usually happen several months in the future—for example, betting that your favorite team will win the Superbowl before the start of the season. There are usually very high payout rates associated with future bets since the risk factor is very high.

Head-to-head bet: These wagers involve bettors predicting the results between two of the players in a team (scores, goals, points, yards, and such) regardless of the overall result of the match.

Flexible-rate bet: Also known as “totalizators”, flexible-rate wagers feature dynamic odds that change according to the share allocated to each possible outcome, taking into account the return rate of the bookmaker that offers the bet.

Before betting on a bookmaker site, it is advantageous to know the rules for tennis bets of each bookmaker site.

Bets on the winner

In tennis, the most common bets are placed on the winner of the game. Among the bookmaker, there are two rules for this type of betting:

- The bet on the winner: from the point the game starts (Betclic, Bwin or Interwetten)
- The bet on the winner: from the point a set is played (Sportingbet and Unibet)

Finally Betclic specify that the bet is valid on the winner from the point the game starts and must therefore be understood as live bet.

Bets on the number of sets, the number of games and points

All online betting sites have the same rule. The subject of the bet must be completed that the bet becomes valid. For example, if you predict that a set has 9 games, the set needs to be already completed that your bet becomes valid. If you bet on the number of sets in a game and a player gives up during the game, your bet will be cancelled and you get your money back.

Sportingbet explains its rule for the winner of a point like this: The bet on the winner of a point will be cancelled if the point is not played, or if the point is awarded on the basis of a penalty. On the other hand, the bet to win the game and the number of points stays adhere, even if the game thanks to one or more penalty points has been won.

Bets on a displaced Game

On all online bookmaker sites, the bets stays adhere if the date of the game, the place or the soil is changed. The bets on the games take place on several days stays adhere. This rule is especially important to Wimbledon and the U.S. Open. These tournaments are often tournaments held on various days and on different soil … for reasons of rain or darkness.