Hillstar pictured on his way to victory at Royal Ascot in 2013© Photo Healy Racing
Hillstar gained the first Group One victory of his career by winning the Pattison Canadian International at Woodbine but there was misfortune for the Brown Panther team.
Having looked fractious before the race, Tom Dascombe's Irish St Leger winner dumped Richard Kingscote on the turf and bolted.
Unfortunately for connections, who include ex-footballer Michael Owen, Brown Panther was withdrawn.
There were no dramas for Sir Michael Stoute's Hillstar, however, and everything went like clockwork in the race.
Ryan Moore was in the perfect position throughout and swung three wide off the bend in a slingshot manoeuvre, shooting clear.
While the American raider Big Blue Kitten closed inside the final furlong, Hillstar had the race won a long way out.
Moore said afterwards: "I was out a little bit too early but he was fine and plenty and it was going to take a good horse to get by him.
"Like Brown Panther, he (Hillstar) was the best horse in the race and just felt we would keep it as simple as we could.
"I am sure the boss (Stoute) had this race as a target from a long way out and it was always something we had in the backs of our minds if things were going well. I moved a bit too early today but he was the best horse and we kept it straightforward again."
Kingscote said: "Just before the break, the horse got wound up and unfortunately he got me off. When I got back on, I tried to keep him relaxed and as soon as I let go he bolted. There wasn't much I could do after that.
"He's never done that before. He sometimes dances about and gets on his toes, but he's never been that extreme."
Dascombe added: "It's very disappointing. Well done to the winner (Hillstar) and the connections of Caspar Netscher (Nearctic Stakes winner). It wasn't our day today."
A disappointed Owen tweeted: "Long way too come for nothing! Thank goodness horse and jockey are both okay."
