No assurance or any guarantee that the team will win it's still depending from how lucky you are, though there's edge knowing the the team or the player that you are betting with, you can use their past performance to be a basis whether they can overrun their opponents, everything will be depending to the outcome of the game or session that you involve yourself, if you are lucky then you'll win if not then even you research deeply if not for you then you'll suffer still.
It is no guaranty that we will still be a winner but when we will have a chance to analyze and we know how to analyze then it will have more chances to be a winner instead of to be a loser. Those who are experts might not be too loser than who is no skill and experience of research and those people must have to depends on luck only.