Question: Sydney Mervin "Merv" Batt was a frequent opponent for many foreign wrestlers travelling overseas including NWA World Heavyweight Champions such as one who was called, "probably the greatest champion of the 20th century." by who?
{'answer': 'Don Leo Jonathan', 'supporting_facts': [['Steve Rickard', 0], ['Steve Rickard', 2], ['Jack Brisco', 0], ['Jack Brisco', 2]]}