|Muhammad Ali proclaimed 'I am the greatest!' And he wasn't wrong. With 56 wins 37 of them by knockout and 5 losses over a 21-year career Muhammad Ali became our nation's most adored athlete and champion for his prowess in the ring and his loveable arrogance outside. His autograph is a must have for any true sports fan. This Muhammad Ali autograph is guaranteed authentic and includes a Certificate of Authenticity from Online Authentics.