Despite being set off on odds of 16/1, George Boughey's Cachet ran home the winner in the Qipco 1000 Guineas at Newmarket.
It marked Boughey's first Classic success, but was remarkably the second Classic of the weekend for jockey James Doyle, who followed up from his victory aboard Coroebus in the 2000 Guineas on Saturday.
Highclere-owned daughter of Aclaim owes much of the success to her incredible start, which saw her open up a lead on the pack.
From there, Cachet never looked back, and despite a strong late challenge from Ralph Beckett's Prosperous Voyage, she finished in front by a neck.
Following the victory, Boughey labelled it a "very special day" and praised a "peach of a ride" from his jockey.
"It's a very special day and I've got a lot of people to thank for getting here, but most notably the filly," said Boughey.
"She's been a superstar since she walked into the yard. It was always going to be the question, that long final furlong, but she's a star.
"It was a peach of a ride from James and she's held on."
Doyle was unable to fight away the emotions after sealing an impressive double this weekend.
"I promised I wouldn't get emotional today but that was incredible, wasn't it?
"I rode her a couple of times last year, to a Group One place in the Fillies' Mile, and we were talking about it beforehand, myself and George - she seems to be much stronger this year.
"That last half a furlong took forever and I was praying for the line, but she's all guts, she loves this track."
He added: "A special thank you to George, it's a young, growing team and he's doing amazing things - I think he's a name we're going to be hearing a lot about in the future."