As well as it’s status as the worlds leading betting exchange  Betfair also now runs a market leading sportsbook So now you’ve got the best of both worlds  all the flexibility of the exchange which at Betfair allows you to choose your own odds  bet on selections to lose and even act as bookmaker! Or you can choose to simply back selections on the Betfair sportsbook  safe in the knowledge that their market leading odds will be still be up for grabs