Question: who has the most saves in the mlb
[{'answer': 'Mariano Rivera', 'provenance': [{'wikipedia_id': '6766939', 'title': '300 save club', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6766939', 'title': '300 save club', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 858, 'bleu_score': 0.7656922706805771, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7231952406204431455}, 'section': 'Section::::Abstract.'}]}]