Tranquil Star won the Group 1 Mackinnon Stakes (2000m) in 1942, 1944 and 1945, the only horse on the list not to win their three Group 1s in successive years. She was aged five, seven and eight, and her third win was arguably her best, turning the tables on another star mare Flight who had beaten her in Sydney earlier in the year.
The only other horse to win three of the same Group 1 at Flemington was Wakeful over 100 years ago, successful in the 1901, 1902 and 1903 Mackinnon Stakes (formerly the VRC Melbourne Stakes).
Four outstanding mares have managed the feat in which Mr Brightside attempts on Saturday, and perhaps even more damning is that there have been plenty to win two of the same race.
44 other horses have won two of the same Group 1 at Flemington including the likes of Winx, Nature Strip, Peter Pan (2 x Melbourne Cup and 2 x Mackinnon Stakes), Phar Lap, Mahogany, Vo Rogue and Schillaci, just to name a few.