Question: how many courts does the us open have
[{'answer': '22', 'provenance': [{'wikipedia_id': '82729', 'title': 'US Open (tennis)', 'start_paragraph_id': 13, 'start_character': 9, 'end_paragraph_id': 13, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::History.:1915–1977: West Side Tennis Club.\n'}]}]