Question: who did roger federer beat in his first grand slam
[{'answer': 'Mark Philippoussis', 'provenance': [{'wikipedia_id': '262376', 'title': 'Roger Federer', 'start_paragraph_id': 26, 'start_character': 113, 'end_paragraph_id': 26, 'end_character': 131, 'bleu_score': 1.0, 'section': 'Section::::Tennis career.:2003: Grand Slam breakthrough at Wimbledon.\n'}]}, {'provenance': [{'wikipedia_id': '262376', 'title': 'Roger Federer', 'start_paragraph_id': 27, 'start_character': 0, 'end_paragraph_id': 27, 'end_character': 454, 'bleu_score': 0.7681529174203731, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6023840937677899450}, 'section': 'Section::::Tennis career.:2003: Grand Slam breakthrough at Wimbledon.\n'}]}]