user: Question: who is the runner-up when the winning score is −16 (68-70-65-65=268)?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Jun 24, 2007', 'Travelers Championship', '−15 (62-71-67-65=265)', 'Playoff', 'Jay Williamson']
SQL:

assistant: SELECT "Runner-up" FROM "Table" WHERE "Winning score" = '−16 (68-70-65-65=268)';