WBC & WBA World Heavyweight titles. Win Joe Bugner Decision (unanimous) 15 (15) 01975-06-30 June 30, 1975 7001330000000000000 33 years, 7002164000000000000 164 days Kuala Lumpur, Malaysia Retained The Ring , WBC & WBA World Heavyweight titles. Win Ron Lyle TKO 11 (15) 01975-05-16 May 16, 1975 7001330000000000000 33 years, 7002119000000000000 119 days Las Vegas, NV Retained