Shamrocker made history in several ways at today's 150th AJC Australian Derby, becoming just the ninth filly since inception to win the three-year-olds feature, beating all colts and geldings.
The Danny O'Brien-trained filly also broke a 22 year drought, being the first to win since Research in 1989.
On top of this, she also became the first filly to complete the Australian Guineas / Australian Derby double.