Proclamation stormed from last to first to edge out Soviet Song in a thrilling Cantor Sussex Stakes over one mile at Glorious Goodwood on Wednesday.
The Mick Kinane-ridden colt beat the 2-1 favourite, last year's winner, by half a length with Kieren Fallon on board Ad Valorem in third.
In descending rain and mist, 3-1 shot Proclamation settled down at the back before igniting two furlongs out.
Soviet Song also came from near the back on soft ground on the Downs.
Ad Valorem took up the running from the off and was tracked by Mac Love and Kandidate.
But despite the whirlwinds that swept past him, Fallon kept the 12-1 chance going to finish two and a half lengths back.
Last year's runner-up Nayyir, under Eddie Ahern, was fourth.
Kinane told BBC Sport: "I went a bit sooner than anticipated because I was always going to be the last to play my cards.
"But the opportunity arose for me to make my move, fly down and get Johnny (Murtagh on Soviet Song) as he was moving through and hold him a bit.
"I thought I'd make my move and if can come and catch me, all well and good. He is a high-class colt."
Proclamation won the seven-furlong Jersey Stakes at Royal Ascot at York last month and also won at Goodwood in May.
His trainer Jeremy Noseda said: "He's got a huge turn of foot and loads of talent.
"I asked Mick to be the last one to deliver his challenge but when he saw the opportunity to put Johnny back in the box, that's what he did.
"The horse got there a little bit too soon, but he has always had a mass of talent.
"I'm delighted and a lot of credit goes to the team at home."
Soviet Song's trainer James Fanshawe said: "She is still the queen but Proclamation was king today.
"She's run a hell of a race and Proclamation has won, but our filly has run a very good race to come second.
"She settled really well today and she got a bit warm before the race. She does like to come with a run.
"Proclamation sprinted clear and Johnny couldn't keep up with him at that stage. But she stayed on very well.
"We'll see how she comes out of the race, but we've got the Breeders' Cup in mind at the end of the season."