KEW Gardens is set to be Aidan O’Brien’s main challenger for next Sunday’s Prix de l’Arc de Triomphe. The impressive St Leger winner is best priced at 16/1 in a market that has Enable as short as 11/10 to win the race again after her successful comeback at Kempton earlier this month. Irish Oaks and Yorkshire Oaks heroine Sea Of Class is next in the betting at 5/1.