Amateur player James Cahill pulled off the biggest shock in the history of the World Snooker Championship as he defeated the five-time champion, and one of the best players of all time, Ronnie O’Sullivan. The 23-year-old qualifier led O’Sullivan. 5-4 overnight, but most pundits and observers expected him to fall away. However, he did the opposite, racing to an 8-5 lead. The former champion fought back to level the tie but Cahill, a potter from Blackpool, held his nerve to secure an astonishing 10-8 first-round win. Cahill doesn’t even have a world ranking, such was his status in the game, but he’s pulled off the biggest snooker upset ever and one of the most famous sporting underdog wins. We’ve taken a look at some other notable upset wins, how do you think Cahill’s compares to any of these?