user: Question: WHAT WAS THE YEAR WHEN THE RUNNER-UP WAS William Mehlhorn?
Columns: ['Year', 'Championship', '54 holes', 'Winning score', 'Margin', 'Runner-up']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1914.0, 'U.S. Open', '2 shot lead', '+2 (68-74-75-73=290)', '1 stroke', 'Chick Evans']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Runner-up" = 'William Mehlhorn';