Question: Who won the singles title at a 1973 tennis tournament held at a Los Angeles arena designed by architect Charles Luckman?
{'answer': 'Margaret Court', 'supporting_facts': [['1973 British Motor Cars of Los Angeles', 0], ['1973 British Motor Cars of Los Angeles', 3], ['The Forum (Inglewood, California)', 0], ['The Forum (Inglewood, California)', 4]]}