user: Question: Who was the partner that played against Serena Williams Venus Williams?
Columns: ['Outcome', 'Year', 'Championship', 'Surface', 'Partner', 'Opponents in the final', 'Score in the final']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 2006.0, 'US Open', 'Hard', 'Dinara Safina', 'Nathalie Dechy Vera Zvonareva', '6–7, 5–7']
SQL:

assistant: SELECT "Partner" FROM "Table" WHERE "Opponents in the final" = 'Serena Williams Venus Williams';