CREATE TABLE table_73740 ("Year" FLOAT, "Division" FLOAT, "League" TEXT, "Reg. Season" TEXT, "Playoffs" TEXT, "Open Cup" TEXT)

Name the number of playoffs for 3rd round
SELECT COUNT("Playoffs") FROM table_73740 WHERE "Open Cup" = '3rd Round'
SELECT COUNT("Playoffs") FROM "table_73740" WHERE "Open Cup" = '3rd Round'