CREATE TABLE table_40920 ("Game" FLOAT, "Date" TEXT, "Set 1" TEXT, "Set 2" TEXT, "Set 3" TEXT, "Set 4" TEXT, "Set 5" TEXT, "Result  ( sets ) " TEXT, "Result  ( Pts ) " TEXT)

What day was there a set 1 of 25-18?
SELECT "Date" FROM table_40920 WHERE "Set 1" = '25-18'
SELECT "Date" FROM "table_40920" WHERE "Set 1" = '25-18'