Group One winner First Seal has been retired after a career which netted six wins from 21 starts and early bragging rights over Winx.

The star of her three-year-old spring, First Seal relegated Winx to second in both the Group Two Tea Rose Stakes and Group One Flight Stakes.

In the autumn she finished in front of Winx in the Vinery Stud Stakes when second to Fenway, the fifth of five times she beat her home.

First Seal's three-year-old season earned her NSW Horse of the Year honours.

Winx began a 17-race winning streak in the Sunshine Coast Guineas in May 2015 while First Seal was beset by hoof problems for the rest of her career which ended after her gallant sixth in Saturday's Coolmore Legacy Stakes.

Her trainer John Thompson nursed her back time and again with her last win coming in the Group Two Tristarc Stakes at Caulfield in October.

Her latest campaign was thwarted by Sydney's wet tracks with the best of her three performances her third behind Group One winner I Am A Star in the Sunline Stakes at Moonee Valley.

First Seal was raced by the China Horse Club and earned $1.25 million prize money.