Sydney mare Skyerush will be out to overcome history when she chases her first Group 1 success in the Tattersall’s Tiara (1400m) at Eagle Farm on Saturday.

Skyerush will have to break history to win the Tatt's Tiara. Photo by: Steve Hart.

At seven, the Guy Walter-trained sprinter is the oldest horse in the field and as far as the Tatt’s Tiara is concerned that isn’t a good thing.

Since the race began in 1989, no horse older than five has won it. The younger horses have been so successful that Zetolie (1994) and Bonanova (2000m) are the only horses older than four to achieve success.

But while history may not be on the daughter of Super Jet’s side, form certainly is.

Resuming from a brief let-up following the autumn carnival in Sydney, Skyerush has won three of her past four starts. Walter chose to aim Skyerush at the Tatt’s Tiara after she won her last two starts in the Group 3 Doncaster Prelude and the Group 2 Emancipation Stakes.

It is the experienced mare’s second trip to Queensland, having finished a close runner-up in the Tatt’s Tiara last year.

Walter indicated earlier this week the race could be her swan song as a breeding career beckons and said she “deserves her chance” at Group 1 success.

The consistent mare is yet to break through from four attempts in the top grade but boasts a terrific career record of 11 wins and 19 minor placings from 44 starts.

Also out to defy the age barrier is Darley’s six-year-old Shannara. The Octagonal mare is a dual Listed winner but will have to show a serious form turnaround, having not saluted since November 2011.

In four starts this year Shannara is yet to finish better than sixth.