Pair of vintage Sports Illustrated magazines highlighting the two historic bouts between Cassius Clay/Muhammad Ali and Sonny Liston. 1) November 16, 1964, signed Cassius Clay in black marker on cover, which bears a magnificent photo of Clay's fist as it makes contact with Liston's mouth. PSA has graded the signature GEM MINT 10. 2) May 24, 1965, signed Muhammad Ali in black marker; Ali is posed in front of a large portrait of Liston. PSA has graded the signature GEM MINT 10. Both magazines are in VG-EX condition, with no mailing label on either. Full individual LOAs from PSA for each magazine.