user: Question: Name the tournament for Semifinal Hard surface for opponent of Pam Casale
Columns: ['Tournament', 'Date', 'Surface', 'Round', 'Opponent']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['U.S. Indoor Championships', 'Feb 20–26', 'Carpet', '1st Round', 'Nancy Yeargin']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Round" = 'Semifinal' AND "Surface" = 'Hard' AND "Opponent" = 'Pam Casale';