CREATE TABLE table_72098 ("Year" FLOAT, "Division" TEXT, "League" TEXT, "Regular Season" TEXT, "Playoffs" TEXT, "U.S. Open Cup" TEXT)

which round is u.s. open cup division semifinals
SELECT "U.S. Open Cup" FROM table_72098 WHERE "Playoffs" = 'Division Semifinals'
SELECT "U.S. Open Cup" FROM "table_72098" WHERE "Playoffs" = 'Division Semifinals'