user: Question: Which Rank has a Runner -up smaller than 0?
Columns: ['Rank', 'Country', 'Winner', 'Runner -up', 'Losing Semi- finalist']
Types: ['real', 'text', 'real', 'real', 'real']
Sample row: [1.0, 'Mexico', 5.0, 4.0, 5.0]
SQL:

assistant: SELECT "Rank" FROM "Table" WHERE "Runner -up" < 0.0;