If you were told the outcome of a soccer match, hours before the match was scheduled, and you were assured that it would 100% win, how much would you be willing to bet on it? Assuming it was a 100% cant lose situation.
In this case I will try to verify how true or reliable the source of news. If I get any temptation of this, I will never bet on a big deal. Because such rumors are often heard. After the bet, when the results will be different, there will be nothing to do. Fixing information is never leaked. If it comes out, then you have to understand that there something is wrong. In my perception it will be better to avoid such situations.