user: Question: What is the Runner-up on April 11?
Columns: ['Tournament', 'Surface', 'Week', 'Winner', 'Runner-up', 'Semifinalists']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Indian Wells', 'Hard', 'March 7', 'Roger Federer (1) 6–2, 6–4, 6–4', 'Lleyton Hewitt (2)', 'Guillermo Cañas (14) Andy Roddick (3)']
SQL:

assistant: SELECT "Runner-up" FROM "Table" WHERE "Week" = 'April 11';