Electrocutionist put in a storming late run to win the Dubai World Cup, the world's richest race.
Detorri rode his mount beautifully
Frankie Dettori's mount made a poor start from stall one but was made work hard to move back into contention.
Turning for home, the Godolphin-trained favourite was down the field behind the impressive Brass Hat and Wilko.
But Dettori switched his mount superbly with six furlongs to go and once he accelerated, he was in control and overhauled his rivals close to home.
Electrocutionist won last year's Juddmonte International at York last year when trained by Valfredo Valiani, but Godolphin swooped for the son of Red Ransom during the winter
"He jumped away really slowly and the American horse was much faster than us," said Dettori.
"I couldn't get the position I wanted just behind the leaders but once I got him out, I knew he would battle and he quickened up brilliantly.
"When I got him on the outside I knew that he would do it because he has a lot of heart."
It was a second win of the day for Dettori and Godolphin after Discreet Cat won the UAE Derby.
Earlier, the Brian Meehan-trained David Junior ran out a comprehensive winner of the nine-furlong Dubai Duty Free.
Jamie Spencer settled David Junior in fifth as The Tin Man and Asakusa Den'en set the early pace and the rider still had much to do turning for home.
But when Spencer gave the signal for David Junior to go, he picked up impressively to leave his rivals toiling in his wake.
Ouija Board could finish only fourth as Japanese runner Heart's Cry cruised to an easy success in the Dubai Sheema Classic, followed by Alan Swinbank's Collier Hill.
The Ed Dunlop-trained Ouija Board, a former English and Irish Oaks winner, travelled well but had too much ground to make up.
Dubai World Cup meeting results
1340 Godolphin Mile
1 Utopia Y Take 13-2 2 Win River Win H Karatas 25-1 3 Jack Sullivan E Ahern 9-4 Fav, 10 ran.
1415 UAE Derby
1 Discreet Cat L Dettori 2-1 2 Testimony G Gomez 66-1 3 Flamme De Passion Y Take 16-1. 13 ran.
1455 Dubai Golden Shaheen
1 Proud Tower Too D Cohen 5-1 2 Thor's Echo C Nakatani 9-1 3 Jet West G Gomez 10-1, 15 ran.
1550 Dubai Sheema Classic
1 Heart's Cry C P Lemaire 11-4 2 Collier Hill D McKeown 22-1 3 Falstaff J Murtagh 25-1. 14 ran.
1630 Dubai Duty Free
1 David Junior J Spencer 9-2 Fav 2 The Tin Man V Espinoza 14-1 3 Seihali J Murtagh 25-1. 15 ran.
1720 Dubai World Cup
1 Electrocutionist L Dettori 5-4 Fav 2 Brass Hat W Martinez 11-2 3 Wilko G Gomez 33-1. 11 ran.