"In honor of Muhammad Ali's 65th birthday, ESPN looks back at the iconic fighter's extraordinary influence on the worlds of sports, politics and culture, especially during the tumultuous decades of the 1960s and '70s. Boxing fans will relish the inclusion of two of Ali's most famous bouts: a brutal, 15-round battle against Smokin' Joe Frazier in 1975 and a match against Poland's Zbigniew Pietrzykowski at the 1960 Olympics."