I'm going to make a couple of minor changes:

SIRES
Mentality
Universal Queen
De Lago Mist
Churchill Downs
----------
Casino Prince
Diego Garcia


DERBY
Sepia
Headturner
De Beers
Spinney
----------
Primus
Goldtown


DONCASTER
Malcolm
Racing To Win
Mnemosyne
Apache Cat
----------
Patezza
Johan's Toy