Frankie Dettori has issued an ominous message to Lady Aurelia's rivals ahead of the Coolmore Nunthorpe Stakes as he feels York may suit her even better than Ascot.
The Wesley Ward-trained filly blitzed the field for the second year running at the Royal meeting, this time against her elders in the King's Stand.
Dettori was forced to miss the ride on her that day through injury, but he will be back in the saddle on the Knavesmire after his sensational victory aboard Enable in Thursday's Yorkshire Oaks.
"I think it was an almighty performance in the King's Stand. She brushed aside some great older horses," Dettori told Racing UK.
"She's a typical sprinter. She's on her toes and she has two switches - slow and fast. There's nothing in between.
"Last year we tried really hard to get her to run over six furlongs. We got away with it in the Prix Morny, but for me five furlongs is ideal for her.
"I would say she is (the one to beat) after what she's done. I think York will suit her as she's got tremendous speed and typically American horses like a flat track. York might suit her better than Ascot."
Marsha has run with credit this season and attempts to return to winning ways in the fifth sprint leg of the Qipco British Champions Series.
"She is very consistent, run in all the top sprints this year and been placed every time," said trainer Sir Mark Prescott.
"The Nunthorpe looks a marvellous race with some very, very fast horses in it and she is entitled to be there but Lady Aurelia and Mr Hills' horse have both beaten her this year.
"They have beaten her fair and square before but in sprints, tiny little things make a big difference."
Clive Cox runs Profitable and Priceless, the former having finished second to Marsha, Lady Aurelia and Battaash this season.
"Profitable is in great form and I'm really pleased with him," said Cox.
"I'd say Lady Aurelia is the one to be beat, but we are 4lb better off with her compared to Ascot. Last year (when sixth), Take Cover put paid to his chance at the start and he never really found any rhythm. He's a Listed winner at York, so the track is not a worry."