Favourite Elm Park was an impressive winner of the Racing Post Trophy for trainer Andrew Balding at Doncaster.
Owner Sheikh Fahad Al Thani said the 13-8 victor, ridden by Andrea Atzeni, could be a contender for the 2015 Derby at Epsom.
Atzeni, successful 12 months ago on subsequent St Leger winner Kingston Hill, had few concerns in a fine front-running display.
He won by two-and-three-quarter lengths from Aloft, with Celestial Path third.
After victory in the final Group One of the 2014 British flat racing season, Elm Park was rated at about 20-1 by bookmakers for next year's Derby.
Atzeni, who will officially take on the role of number one jockey to Sheikh Fahad's Qatar Racing operation next season, said: "It meant a lot, taking a new job - it's just amazing.
"I've won a Group Three race (in the colours) and now a Group One, before the job even starts!"
Earlier, 14-1 shot Wishfull Thinking jumped superbly under Richard Johnson to win the Old Roan Chase at Aintree for trainer Philip Hobbs.