The Ralph Beckett-trained Cubanita collared Sajjhaa in the dying strides to claim the Betfred EBF Gillies Fillies' Stakes at Doncaster.
Dropping from Group One to Listed level, Godolphin's highly-rated Sajjhaa was sent off the 7-4 favourite and looked to have sealed it when Mickael Barzalona swept to the front approaching the two-furlong pole.
But her stride was shortening just as Cubanita's abundant stamina was kicking in entering the distance, and Jim Crowley's mount (8-1) was half a length to the good as they flashed past the line.
The lightly-raced maiden winner Reckoning ran on encouragingly to fill the places under champion jockey Richard Hughes.
Crowley said: "It's been stop-start with her this season so hopefully she'll stay in training next year, fingers crossed. I got a good trip round. They went a good gallop and everything went well in the end. I think she'll get a mile and a half. The last furlong was her best furlong."
Godolphin clinched the owners' championship with a double through Mar Mar and Muharrib, both trained by Saeed bin Suroor.
Mar Mar (7-2) showed a neat turn of foot two furlongs out to easily win the Betfred Cock O'The North EBF Maiden Stakes by four lengths under William Buick.
"She's a very honest filly, but she was a bit unsettled and keen last time, so we thought visors would help. She'll be a nice seven-furlong filly for next year," said Godolphin's representative Diana Cooper.
Muharrib (5-1) led over a furlong out under Barzalona to defy top weight in the Betfred 'The Home Of Goals Galore' Nursery.
Cooper said: "He's a very bonny horse who has thrived all season. He'll have a nice holiday now and he's one to look forward to. He's very honest and game and gives his all every time."
24 May 2015O'Brien still has Derby puzzle
Air Force has lift-off on debut
Guineas glory for Pleascach
More Curragh Gold for Kazeem
Curvy holds off Canaletto
Super Solow takes Longchamp prize
Full steam ahead for Mast return
Varian pleased by Belardo effort
Dirty scope blamed for Byron run
Ascot test for Time
Mustajeeb sprints to it
Pearl's a sprint jewel for Barron
Tate springs Listed surprise
First Ascot chance for Crisford
Glen best miler we've had - O'Brien
Exciting options for Simcock ace
Muta grabs Bowl with late charge
No decision on replacement - McCoy
Harrington bids for Guineas glory
23 May 2015Mustajeeb sprints to it
Big-race options for Corsican team
Gagarin in orbit for Gallinule
Tudhope back for Force mount
Luck be a Lady for Burke
Gleneagles tees off at Curragh
Stars dazzles at Goodwood
Dettori receives golden ticket
Tudhope suffers Haydock blow
Gatsby in great form for Gold run
O'Brien banking on Found progress
Sole seeking home success
Remote makes Festival return
Force back for Temple test
22 May 2015Paris in Sandown shake-up
Ivawood targets Guineas revenge
Brooch aiming to sparkle again
Dods hoping Angel can soar
Cumani hangs fire as Dubai dazzles
Dods hoping for Angel delight
Epicuris team seek dispensation
Treve buzzing for Corrida comeback
No going concerns for Gatsby
Gleneagles spearheads Guineas field
Power to stay in Ireland
Muthmir earmarked for Haydock date
21 May 2015Ground concerns for Pretend
Ball back on duty at Worcester
Ground key to Boy Gold run
Fitz up against it for Galway
Hobbs to race in Godolphin blue
Haggas has plenty to Wonder about
Straight to Ascot for Rizeena
Curragh all set for big weekend
Byron in Greenlands hunt
Sandown or Epsom options for Spring
O'Brien looks to Tapestry
Europe the 'horse of a lifetime'
Legatissimo in Oaks reckoning