CREATE TABLE table_76795 ("Year" FLOAT, "Tournament" CLOB, "Surface" CLOB, "Round" CLOB, "Winner" CLOB, "Score" CLOB, "Length  ( H:MM ) " CLOB, "Sets" CLOB, "Federer" FLOAT, "Nadal" FLOAT)

What were the sets when Federer had 6 and a nadal of 13?
SELECT "Sets" FROM table_76795 WHERE "Nadal" = '13' AND "Federer" = '6'
SELECT "Sets" FROM "table_76795" WHERE "Federer" = '6' AND "Nadal" = '13'