Integral comprehensively reversed Newmarket form with Esoterqiue as she routed the field in the Duke of Cambridge Stakes
The pair were separated by a head when they clashed on the Rowley Mile in early May but the market was full of confidence behind Sir Michael Stoute's filly who was backed into 9/4 favouritism.
That confidence wasn't misplaced as Ryan Moore oozed confidence about the four-year-old who settled nicely in midfield behind an even pace with Esoterique in his sights.
The response was instantaneous when Moore asked her to quicken and she scooted past L'Amour De Ma Vie to win by two lengths in a course record time.
There were a further two lengths back to Purr Along who came around the whole field having been held-up in last while Sky Lantern shaped as though her first run of the season was needed in finishing fifth under a penalty.
Moore said: "She's a very talented filly. She came in very late and all she's done is improve with every start. She's got a lot more professional. She won well and I kind of hoped she'd do that really.
"It went very smoothly. She took me there a bit earlier than I'd have wanted, but I was running out of horses to follow at that stage.
"It's not firm ground. You get track records when it's a good surface. It's on the faster side of good, there's a good covering of grass and it's in good condition."
The winning trainer Sir Michael Stoute added: "She's a good filly and progressing. I'm really delighted. It was a good run in the Dahlia Stakes and we knew we'd come on from that. She's got a great engine and great speed. She could be effective at less than a mile, that's for sure.
"There's the Falmouth Stakes (at Newmarket) and the Matron (at Leopardstown), so she's got a programme, but we could always duck into a seven-furlong race."
Chris Richardson, managing director for winning owners Cheveley Park Stud, said: "She's got some turn of foot considering there's not a lot of her. She sparkled in her work last week, so we were quite hopeful.
"This is the fourth time we've won this race, so it's very exciting. I suppose now the Falmouth would be an obvious consideration."
The runner-up's trainer Pia Brandt said: "The leader cracked, so she got to the front a little bit too early, but she stayed on and the winner was better today. She has proved she can do it in Europe. She won in Dubai so we knew she was a pretty good filly.
"I'm proud of her and we could easily bring her back here now. Otherwise there's Deauville and maybe a race in the States. We'll see what we can find and we'll make a good programme for her."
Johnny Murtagh said of Purr Along: "I don't like going into number three, I'd rather be in number one, but she ran very well. We were unsure about the ground, but Jamie (Spencer) said she handled it very well.
"It was a very competitive race and I liked the way she stayed on to the line. She's entered in the Falmouth and she ran very well there last year. I'm not sure yet, we'll see how she comes out of the race.
"She's very tough and very genuine and she puts her heart into it. I hope she's a Group One filly and I think she's a Group One filly. It's not easy, but I hope she can prove to everyone she is."