Table schema:
CREATE TABLE table_name_73 (set_2 VARCHAR, set_1 VARCHAR, score VARCHAR, date VARCHAR)

Question: What is Set 2, when Score is 3-0, when Date is May 11, and when Set 1 is 25-20?
SQL: SELECT set_2 FROM table_name_73 WHERE score = "3-0" AND date = "may 11" AND set_1 = "25-20"