Willow Brook has proven herself by winning multiple Performance Championships in the English division.

Willow Brooks' sire was born in Ireland and brought to the United States to race, where he won graded races until he was five years old. His biggest victory was a wire to wire victory in the 1991 Breeders Cup Classic, and earned the Horse of the Year award for that year.

Her dam was winner of 13 races, leading her to be the 1988 Eclipse Award for Outstanding Older Female Horse, and launching her dam Grecian Banner® into being named Kentucky Broodmare of the Year. She won the Breeder's Cup Distaff over Kentucky Derby winner Winning Colors®, along with many other G1 races, ultimately being undefeated in the 7 races of her 4 year old year.