So gambling games require luck to win, that is what we should know. But many people lose their money because they don't consider about the luck in gambling. In sport, the situation can change anytime from the weak team into a strong team that beat the opponent team.
The weak team can change the situation when they get a right momentum that can be called as their luck to beat the opponent team. If the weak team can change the situation and win, those people who choose the strong team may lose their money because they choose the strong team as their bet. All of that is because luck come to the weak team.
Not only that, but also only 1/2 over on cricket can change a lot. For example, 2 overs need 48 runs while their average run is 10 runs per over. In this situation, they are almost in lose as they require 24 runs per over. But if a play can make 36 runs on the first over, then it is not impossible to make 12 on another or something like that. And the same thing may happen for losing a wicket while they need a small run rate and have a good number of wickets. But they may lose several wickets on the same over, as a result, they may lose the favor.