CREATE TABLE table_24089503_1 (breeders_cup_friday VARCHAR2, breeders_cup_saturday VARCHAR2)

What was the Breeder's Cup Friday attendance for the year the Breeder's Cup Saturday had 52,987?
SELECT breeders_cup_friday FROM table_24089503_1 WHERE breeders_cup_saturday = "52,987"
SELECT "breeders_cup_friday" FROM "table_24089503_1" WHERE "52,987" = "breeders_cup_saturday"