user: Question: What is the championship when the margin was 2 strokes, there were 54 holes with a 1 shot lead, and the runner-up was David Duval?
Columns: ['Year', 'Championship', '54 holes', 'Winning score', 'Margin', 'Runner(s)-up']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1997.0, 'Masters Tournament', '9 shot lead', '−18 (70-66-65-69=270)', '12 strokes', 'Tom Kite']
SQL:

assistant: SELECT "Championship" FROM "Table" WHERE "Margin" = '2 strokes' AND "54 holes" = '1 shot lead' AND "Runner(s)-up" = 'David Duval';