user: Question: which round is u.s. open cup Division Semifinals
Columns: ['Year', 'Division', 'League', 'Regular Season', 'Playoffs', 'U.S. Open Cup']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1993.0, '3', 'USISL', '4th, Atlantic Division', 'Divisional Semifinals', 'Did Not Enter']
SQL:

assistant: SELECT "U.S. Open Cup" FROM "Table" WHERE "Playoffs" = 'Division Semifinals';