Fascinating Rock ran down Jack Hobbs to spring a surprise in the £1.3m Qipco British Champion Stakes at Ascot.
Jack Hobbs, the Irish Derby hero, looked like collecting from his wide draw when he hit the front early in the straight after taking over from his pacemaker Maverick Wave.
However, the evens favourite pricked his ears and did not open an immediate advantage.
Pat Smullen delivered the 10-1 winner with a telling run to lead inside the final furlong and Dermot Weld's four-year-old went on to take the mile-and-a-quarter feature by a length and a quarter.
Found stayed on from the rear to claim second place, half a length ahead of Jack Hobbs.
Smullen said: "Our horses fly around here. I think he has been an underestimated horse, the ground and everything else was right for him today. They went fast, there was a good ease in the ground and 10 furlongs is his right trip.
"He's a very good horse and is improving all the time, you can see how big he is - he can only improve. I wanted to be closer than I was, but they went so fast so I sat back and decided to take my chances."
Weld said: "This has been the plan for about six months. This was the race I thought would suit him best. Usually the ground is on the slow side. He loves it soft and he's a very good horse in the autumn.
"He was very good at Leopardstown when he won by six lengths and I think he'll make a lovely five-year-old. Hopefully he'll be back here next year to defend his title. I'll talk to the owner and see what he thinks."
Looking to next year, Weld said: "He only get beat a neck by Al Kazeem in the Tattersalls Gold Cup at the Curragh, that was an excellent performance and that would be a logical race to start him off in."
John Gosden, meanwhile, felt a combination of stall 12 of 13 and immaturity cost Jack Hobbs, but he is looking forward to 2016 with him.
The Newmarket trainer said: "Coming to the races in the car, I said to William (Buick) drawn where we are we are going to have to go, we can't sit back and you re going to pay the price at the other end.
"He's run a gorgeous race. I'm very happy with him. He's come back nicely, but he just showed his immaturity as I thought he might, a weakness in the last furlong.
"I have tons of respect for the winner. I thought he was the horse to watch out for and similarly Found, who has come from a long way back. They were two I was frightened of.
"I'm thrilled with our horse. It's all about next year. It was a good run and we'll have a bigger, stronger horse for next year."
He went on: "He could run in something like the Brigadier Gerard at Sandown, it's a good stepping stone for those horses who have won a Group One and I'm not frightened of going straight to a mile and a half with him.
"I think a mile and a half suits his style of racing, a mile and a quarter here today we had to ask him a lot of questions. He's tried to answer every one, but he's only a baby and to that extent I'm very happy with him."
Found's trainer Aidan O'Brien said: "Ryan (Moore) was delighted with her, she ran a great race. I'm very happy with her.
"Ryan had her nice and relaxed and she came home very well. Hopefully she is a filly we can look forward to next year."
