Stradivarius added his name to the illustrious list of former winners, as he made it ten consecutive victories in the Group Two Magners Rose Doncaster Cup.
With Dee Ex Bee a non-runner, just five lined-up for this 2 ¼ mile race.
Cleonte was soon in front but Stradivarius and Frankie Dettori went to the front at a funeral pace, from Sticky Getaway.
Stradivarius passed the post with a circuit to race, with his ears pricked, looking around him. But as the quintet turned away from the stands, Oisin Murphy pressed on with Cleonte.
Heading over Rose Hill, Cleonte led from Sticky Getaway, with Stradivarius racing three lengths adrift in third, followed by Max Dynamite and Barsanti.
Turning into the home straight, Cleonte led by three lengths, with Sneaky Getaway second and Stradivarius moving well.
With a quarter of a mile to race, Cleonte was under pressure and Stradivarius began to close.
He went on with a furlong to race and Dettori just kept him up to his work for a smooth victory by about two lengths from Cleonte, with Max Dynamite third.
The John Gosden trained five year-old has been the star stayer for the past two years and became the first horse to win the stayers’ Triple Crown since Double Trigger.
Gosden said: “He’s a gorgeous horse to train but he was too fresh at home – rearing up, shouting and playing – so I thought we’d better put him in the Doncaster Cup.
“Winning the Gold Cup, Goodwood Cup and this puts him in the top department – he’s a great horse.”