user: Question: What is Date, when Outcome is Winner, and when Opponent is An-Sophie Mestach?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '24 June 2007', 'Davos , Switzerland', 'Clay', 'Jessica Moore', '6–4, 4–6, 6–3']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Outcome" = 'Winner' AND "Opponent" = 'An-Sophie Mestach';