When you head to your weekend soccer or cricket match to cheer on the school team or local club, it's fun and usually not too serious. 
But what you probably don't know is there are a lot more people than you realise taking an interest in what’s going on on the pitch. 
Today, ABC investigative reporter, Pat McGrath, on his Four Corners report into the gambling giants infiltrating community sport.
Featured: 
Pat McGrath, investigative reporter, Four Corners, ABC TV and iview