user: Question: In what tournament did Cipolla face Sergio Roitman?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['29 August 2005', 'Freudenstadt , Germany', 'Clay', 'Sergio Roitman', '7–5, 6–4']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Opponent" = 'Sergio Roitman';