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

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'