Certify faces six opponents as she puts her unbeaten record on the line in the Shadwell Fillies' Mile at Newmarket on Friday.
Godolphin's juvenile completed a hat-trick in the May Hill Stakes at Doncaster earlier this month and is favourite with some bookmakers for the 1000 Guineas back at Headquarters next May.
She faces another unbeaten filly this week in the Mick Channon-trained Ollie Olga, who has also won each of her three starts and missed the May Hill after coming into season the day before the race.
Since finishing last on her racecourse debut, Harry Dunlop's Roz has impressed in winning her last two starts, including a Listed event at Sandown.
John Gosden's Winsili, the Mark Johnston-trained Discernable, Amazonas from the Ed Dunlop stable and Clive Brittain's outsider Masarah complete the line-up.
