user: Question: who is the runner- up when the tournament is Santiago?
Columns: ['Tournament', 'Winner', 'Runner-up', 'Score', 'Third Place']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Delray Beach', 'Mark Philippoussis', 'Aaron Krickstein', '6–3, 6–2', 'None']
SQL:

assistant: SELECT "Runner-up" FROM "Table" WHERE "Tournament" = 'Santiago';