What competition had its first match on December 20, 2007?
CREATE TABLE table_name_15 (competition VARCHAR, first_match VARCHAR)
SELECT competition FROM table_name_15 WHERE first_match = "december 20, 2007"
### Context: CREATE TABLE table_name_15 (competition VARCHAR, first_match VARCHAR) ### Question: What competition had its first match on December 20, 2007? ### Answer: SELECT competition FROM table_name_15 WHERE first_match = "december 20, 2007"