Veteran Prince Bishop sprung a 14-1 surprise as he lengthened clear of American challengers California Chrome and Lea to land the Dubai World Cup at Meydan.
William Buick brought Saeed bin Suroor's evergreen eight-year-old - who was detached in the early stages - to lead a furlong and a half out and win the world's richest Flat race.
Last year's Kentucky Derby hero California Chrome was two and three-quarter lengths further back in second and Lea was third.
Buick, in his first season as a retained jockey for Godolphin, said: "I cannot believe it.
"This horse has come good. I can't express what I'm feeling right now. It's very surreal.
"We were detached last but we ended up travelling very well in the last turn.
"I feel a bit numb at the moment but I'm sure when I get home it will all sink in.
"It's a great team effort."
Bin Suroor had never lost faith in the horse.
He said: "I said to William that it doesn't matter if he jumps slow as usual, don't give up with him and see how he is with the kickback.
"This horse has class and he has a big heart."
