Question: What set 2 has a set 4 of 21-25?
SQL: SELECT "Set 2" FROM "2-15945725-9" WHERE "Set 4" = '21-25';

Question: What was the score when set 3 was 26-28?
SQL: SELECT "Score" FROM "2-15945725-9" WHERE "Set 3" = '26-28';

Question: When was set 3 of 18-25?
SQL: SELECT "Date" FROM "2-15945725-9" WHERE "Set 3" = '18-25';