Question: Who is the partner facing the opponents Florian Mayer & Alexander Waske in the final?
SQL: SELECT "Partner" FROM "2-1409621-4" WHERE "Opponents in the final" = 'Florian Mayer & Alexander Waske';

Question: Which tournament has a Hard surface and final opponents Rohan Bopanna & Mustafa Ghouse?
SQL: SELECT "Tournament" FROM "2-1409621-4" WHERE "Surface" = 'Hard' AND "Opponents in the final" = 'Rohan Bopanna & Mustafa Ghouse';

Question: On which date did the tournament final with the Clay surface take place?
SQL: SELECT "Date" FROM "2-1409621-4" WHERE "Surface" = 'Clay';

Question: Which tournament features the partner Julian Knowle?
SQL: SELECT "Tournament" FROM "2-1409621-4" WHERE "Partner" = 'Julian Knowle';

Question: On which date is the tournament final with the opponents Michael Berrer & Kenneth Carlsen?
SQL: SELECT "Date" FROM "2-1409621-4" WHERE "Opponents in the final" = 'Michael Berrer & Kenneth Carlsen';