Dominant: It’s A Dundeel triumphs in Sydney’s richest race, the $4 million Queen Elizabeth Stakes, at Randwick on Saturday. Photo: Damian Shaw

Racing NSW chairman John Messara hasn’t had a better day at the track.

The first Championships were completed at Randwick on Saturday with It’s A Dundeel, in the black and yellow diamonds of Messara’s Arrowfield Stud, winning the jewel in the crown of a glittering 10-race series – the $4 million Queen Elizabeth Stakes.