user: Question: Who was her partner at the US Open and they were Runner-up?
Columns: ['Outcome', 'Year', 'Championship', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', 1991.0, 'French Open', 'Clay', 'Cyril Suk', 'Caroline Vis Paul Haarhuis', '3–6, 6–4, 6–1']
SQL:

assistant: SELECT "Partner" FROM "Table" WHERE "Championship" = 'US Open' AND "Outcome" = 'Runner-up';