It’s not just casino high-flyers who get to win big. There are plenty of times when sports punters have benefitted thanks to results that have gone against all the odds. Here are just a few examples of football’s biggest betting upsets. In 2004, one of the biggest upsets in international football occurred when rank outsiders Greece lifted the European championship trophy. For a team that was not even fancied to emerge from qualification, the Greek national team took the tournament…