Headman (12-1) looked a horse with Group potential when successfully giving weight all round in the Al Zubarah London Gold Cup.
The Roger Charlton-trained colt was shown plenty of daylight by Jason Watson in the home straight and in a trouble-free passage led over a furlong out, before holding the persistent challenge of 3-1 favourite Sinjaari by a short head.
Charlton said: "He's still a work in progress, a huge horse by Kingman who looks as though he's going on to great things (as a stallion).
"But he's still a work in progress. Last time here he pulled too hard and it was a funny race. Today he was relaxed."
On the question of the Hampton Court Stakes over this trip of a mile and a quarter, Charlton added: "I would quite like not to rush him, but we all love having runners at Royal Ascot. Today he showed he was right up to it, so let's wait and see."
Betfair introduced Headman into the Hampton Court market at 8-1.