SCHEMA:
CREATE TABLE table_24089503_1 (breeders_cup_friday VARCHAR, breeders_cup_saturday VARCHAR)
USER:
What was the Breeder's Cup Friday attendance for the year the Breeder's Cup Saturday had 52,987?

QUERY:
SELECT breeders_cup_friday FROM table_24089503_1 WHERE breeders_cup_saturday = "52,987"