Caspian Prince won Epsom's Investec Corporate Banking Dash for a third time and for his third different trainer.
The front-running eight-year-old was drawn widest of all in stall one but, as ever, he was away quickly under Tom Eaves and was soon at the head of affairs.
He had a break on the field in the final 100 yards and looked home and hosed, only for Duke Of Firenze, another former winner, and Dark Shot to launch late challenges.
The three flashed past together, with Caspian Prince (25-1) adding Tony Coyle's name to the roll of honour alongside Tony Carroll and Dean Ivory, who had previously trained him to victory in this valuable contest.
Dark Shot, last at halfway, was a short-head second, with Duke Of Firenze just a nose away in third.
Owner Stephen Louch said: "What a story, triple Dash! I can't believe it today, I wasn't expecting it, I really wasn't."
Eaves said: "This lad knows more about this place than me. The team have done a great job."
Coyle said: "It feels great, he loves this place. I've only had him six weeks and he knows this place better than most of us. I know changing yards doesn't impress everyone, but it just helps freshen him up.
"I know he had a negative draw today, but with his style of running I knew he would get to where he wanted to be, as he is so quick. He barely gets five furlongs and the downhill in the first furlong just helps him get home.
"In the stalls he was so settled and he barely turned a hair in the parade ring, but if you take him to Musselburgh or Beverley you can't keep the lid on him for some reason. He will go to Musselbugh in a couple of weeks, all being well."
