Question: What type of surface was used for the Carthage tournament on August 14, 1994?
SQL: SELECT "Surface" FROM "2-13604859-2" WHERE "Tournament" = 'Carthage' AND "Date" = 'August 14, 1994';

Question: Which tournament has Marielle Bruens for the opponent in the final?
SQL: SELECT "Tournament" FROM "2-13604859-2" WHERE "Opponent in the final" = 'Marielle Bruens';

Question: What surface was used on May 13, 2007?
SQL: SELECT "Surface" FROM "2-13604859-2" WHERE "Date" = 'May 13, 2007';