user: Question: What was the April 7, 2008 score on a Clay surface?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['April 28, 1999', 'Hatfield , United Kingdom', 'Clay', 'Jean-René Lisnard', '7–6, 1–6, 6–0']
SQL:

assistant: SELECT "Score" FROM "Table" WHERE "Surface" = 'Clay' AND "Date" = 'April 7, 2008';