Here's a write-up on Esposa:
Think about that -- as a 5-year-old mare -- she ran 5 times in the 4-week long Saratoga meeting. She won four times, including the Whitney, Wilson, and Saratoga Handicap all against older males.
As a 6-year-old, she ran 6 times at Saratoga...but caught War Admiral four different times. Her only win was the Butler by 3 lengths in 1:50.60 -- she left Saratoga and dominated in the Hawthorne Gold Cup.
As a 4-year-old, she won the Merchants Handicap at Saratoga over the great Hall of Famer Discovery and that years Jockey Club Gold Cup winner Count Arthur. And she was 2nd in the Whitney.
As a 3-year-old, she was 2nd in the Whitney. No 3yo filly since has ever had a top 3 finish in the Whitney.
As a 2-year-old, she was 3rd in the Hopeful, only one other filly since has had a top 3 finish in the Hopeful.
Esposa also won the Remsen as a 2yo. The Remsen has been a major 2-year-old stakes race since 1904...and Esposa is the only female in history to have won it.
She was competitive racing almost exclusively against top class males every year from age 2 through age 6 -- at every distance from 6 furlongs to 13 furlongs where she beat Seabiscuit and 14 furlongs where she was 2nd to War Admiral at.
Hard to believe no track has a stakes race named after her -- let alone her home track of Saratoga where she always showed up every season to face the absolute best of the superior gender.