Technically, there is one way to guarantee that a profit is made from a fixed odds sports bet - arbitrage.

Different bookmakers vary slightly in the prices they offer for sporting contests. If the variation is great enough, a bet can be placed on each outcome at the best available odds using two or more bookmakers, in such a way that, with correct staking, a profit is guaranteed whatever the result of the game. This possibility arises because, by taking the best odds from different bookmakers, the punter can reduce the overround on the book to below 0%. The book for the punter is then said to be "overbroke" and the betting opportunity is known as an arbitrage, sure win or sure bet ...
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Why Bet On Tennis ?

We believe that Tennis is the best sport for making money.

Firstly there are only two outcomes. This may sound obvious, but it should not be underestimated. The draw in sports like Football can be a major obstacle to long term profits

Secondly, most bookmakers concentrate on sports with a high `margin` or profit like Horse racing ...
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Sports Betting Arbitrage, or Scalping as sports bettors from the US know it, is the combination of a well known financial trading concept and the modern occurrence of online sportsbook betting.
Arbitrage is the idea of taking advantage of different prices in different markets simultaneously, while sports betting arbitrage is the application of that principle to the ‘price’ offered by bookmakers on sporting events: the’ odds’, or ‘the line’.
Essentially, Sports Betting Arbitrage is buying the win and the loss of a sporting event at the correct price to ensure that no matter what the outcome, a profit is secured...
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