Question: where is the rod laver cup being played
[{'answer': 'United Center', 'provenance': [{'wikipedia_id': '51412638', 'title': 'Laver Cup', 'start_paragraph_id': 9, 'start_character': 73, 'end_paragraph_id': 9, 'end_character': 86, 'bleu_score': 1.0, 'section': 'Section::::History.:2018.\n'}]}]