CREATE TABLE table_2990 ("Year" FLOAT, "Kentucky Derby" FLOAT, "The Preakness Stakes" TEXT, "Kentucky Oaks" TEXT, "Belmont Stakes" TEXT, "Travers Stakes" TEXT, "Breeders Cup Saturday" TEXT, "Breeders Cup Friday" TEXT)

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_2990 WHERE "Breeders Cup Saturday" = '52,987'
SELECT "Breeders Cup Friday" FROM "table_2990" WHERE "Breeders Cup Saturday" = '52,987'