CREATE TABLE table_71828 ("Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Opponent in the Final" CLOB, "Score in the Final" CLOB)

When did Mathieu play against Flavio Cipolla?
SELECT "Date" FROM table_71828 WHERE "Opponent in the Final" = 'flavio cipolla'
SELECT "Date" FROM "table_71828" WHERE "Opponent in the Final" = 'flavio cipolla'