Question: What surface was the tournament played on against Steven Diez?
SQL: SELECT "Surface" FROM "2-18089112-3" WHERE "Opponent in the final" = 'Steven Diez';

Question: What date was the game played on the Hard surface at the Tournament of Sweden F2?
SQL: SELECT "Date" FROM "2-18089112-3" WHERE "Surface" = 'Hard' AND "Tournament" = 'Sweden F2';

Question: What was the playing surface for the Tournament of Great Britain F16?
SQL: SELECT "Surface" FROM "2-18089112-3" WHERE "Tournament" = 'Great Britain F16';