American invaders account for half the field which will speed 6 1/2 furlongs on the grass in race named for Horse of the Year
Diabolic
The six-furlong Saturday feature at Woodbine marks the return of Sovereign Award finalist filly from Mark Casse barn.
Stamping herself as the top sprinter in the country, Boardroom glided to victory in the Grade 3 Seaway Stakes.
