Computing the profit given the probability of winning in a sport bet

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Suppose that you can correctly predict the outcome of a tennis match (i.e. the winner) with probability $x > 0.5$. If you gamble on $N$ matches on some betting website, where odds are assigned by the bookmakers to each outcome, what is the minimum $x$ to make profit? Given $x$, how to compute the profit after $N$ matches?