A cat and mouse finish in the Coral Hurdle had Ascot on its feet after Overturn beat Oscar Whisky.
Barry Geraghty crashed out on the last hurdle leaving Overturn to secure first place.
Both jockey and horse are okay.
Jason Maguire on Overturn completed a full circuit of fluent jumping.
Alan King's Katchit came third in the race - the horse hasn't been seen for 389 days - and Choc Thornton had a fantastic ride.
Lough Derg failed to grab the lime-light but will hopefully redeem himself as he is capable of gaining excellent results.
Ascot 2.45: 1st Overturn (IRE) 5/2, 2nd For Non Stop (IRE) 25/1, 3rd Katchit (IRE) 33/1, 4th King of The Night (GER) 5/1. 7 Ran.