user: Question: Who is the runner-up in 1990?
Columns: ['Location', 'Year', 'Champion', 'Runner-up', 'Score']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Lakeway', 1977.0, 'Harold Solomon', 'Ken Rosewall', '7–6, 6–2, 2–6, 0–6, 6–3']
SQL:

assistant: SELECT "Runner-up" FROM "Table" WHERE "Year" = 1990.0;