The 98-year-old race meet at Far Hills in the US state of New Jersey is now as famous for the outrageous antics off the course than for the racing on it.
Tens of thousands of raucous spectators descended on the event for a day of drunken debauchery.
Pictures show fans snogging and stripping as they down alcohol in the muddy fields around the race course.
Police had promised to crack down on drinkers under the legal age of 21but that didn’t dampen the celebrations.
This year was the first time in the event’s history punters had legally been allowed to place bets.
Many revellers were seen getting medical attention after too much boozing.
Others were taken into custody by police covered in blood after fights broke out in the crowd.
The exact number of arrests after Saturday’s event is still unknown.