Question: how many times has nadal won the barcelona open
[{'answer': 'eleven times'}, {'provenance': [{'wikipedia_id': '10287555', 'title': 'Barcelona Open (tennis)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 261, 'bleu_score': 0.7923368737048281, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16540895340279720389}, 'section': 'Section::::Abstract.'}]}]