Enable will have three rivals in her bid for a sixth consecutive Group One win at York in what is expected to be her final race in Britain.

The star mare is odds-on to beat Magical in Thursday's Yorkshire Oaks (2400m), her lead-up to the Prix de l'Arc de Triomphe which she has won for the past two years.

Magical is trained by Aidan O'Brien who also has outsider South Sea Pearl in the race while Enable's John Gosden-trained stablemate Lah Ti Dar rounds out the field.

The world's highest-rated racehorse, Crystal Ocean, headlines the Juddmonte Stakes on the first day of the carnival on Wednesday (Thursday AEST).

Enable beat Crystal Ocean in the King George Stakes at Ascot on July 27 but that was not enough to put her in the No.1 position on the rankings.