Online bets have gone into overdrive across the country, with Sportsbet and Ladsbroke both crashing less than an hour before the race.
"We are currently having some technical issues," Ladbrokes tweeted just after 1.30pm.
"Our team is working on this urgently and we understand that the timing couldn't be worse. We apologise for the inconvenience."
Check out the list of horses in the running here:
Watch the race below!