user: Question: What was the outcome on May 18, 2008?
Columns: ['Outcome', 'Date', 'Surface', 'Partnering', 'Opponents in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', 'April 29, 2007', 'Clay', 'André Sá', 'Martín García Sebastián Prieto', '3–6, 6–2, [10–6]']
SQL:

assistant: SELECT "Outcome" FROM "Table" WHERE "Date" = 'May 18, 2008';