Ok this actually happens to my friend not so long ago, he is going on a boxing match and he will bet for the heavy favorite, then suddenly an unknown guy whisper to him, that the fight is going to be fixed and he supposedly heard it from the favorite to win, locker room, are you going to listen to that and bet for the underdog.
What's your take?
This could possibly happen in any sport. No one actually knows what happens before the start of any match. What is suspicious is why would a random guy tell you that. It is difficult to listen to hearsay or something that he could have heard because of eavesdropping, or the one who told you could be making it up to mess up with your head before bettig. It depends on you who to believe when betting.