Adelaide ran out a gritty winner of the Secretariat Stakes at Arlington to score for Ryan Moore and Aidan O'Brien.
The Galileo colt had not been seen since finishing second in the Belmont Derby in early July but ensured that his American adventure ended on a high note with victory in the prestigious Grade One turf contest.
Sent off a short-priced favourite, he was settled in third by Moore before being wound up by his jockey on the approach to the home straight.
In company with General Jack, he clawed back the advantage of the front-running Tourist to take up the lead inside the final furlong and despite idling slightly, Adelaide kept on under a strong Moore drive to prevail by a length and a half.
"He's the best horse in the race going into it, I just thought we would keep it simple," Moore told www.bloodhorse.com.
"The horse on the lead was getting a bit of a soft hand, so didn't want to move up to early. Adelaide just had more class than the field and got the job done. He's run in France, Ireland, England, America, and America again."
The winner is now set to be aimed at Australia's Cox Plate for his next start.
Tourist held on for second with Sheldon in third and the former's jockey, Joel Rosario, was delighted with the run.
"He ran well," Rosario said. "I had to move a little early and the horse that won the race (Adelaide) was there with me and he got me.
"It was his first time going a mile and a quarter and he did well. I'd love to ride him back, for sure."