1 Muhammad Ali
Muhammad Ali (January 17th 1942 - June 3rd 2016) was an American former professional boxer . He was generally considered among the greatest heavyweights in the history of the sport.
He is most known for his incredible boxing technique but was also increadibly indurable. Took shots from Foreman and Shavers, arguably the best punchers in boxing, and didn't go down. - Bruno2202
2 George Foreman
George Edward Foreman is an American former professional boxer who competed from 1969 to 1977, and from 1987 to 1997. Nicknamed "Big George", he is a two-time world heavyweight champion and an Olympic gold medalist.
Knocked out by featherfisted Ali?
Know for his hard hitting but could also take a hard punch. - Bruno2202
3 George Chuvalo
He was never knocked down in his professional career, not even against Foreman and Frazier. - Bruno2202
4 Joe Frazier
Joseph William Frazier, nicknamed "Smokin' Joe", was an American professional boxer who competed from 1965 to 1981. He reigned as the undisputed heavyweight champion from 1970 to 1973, and as an amateur won a gold medal at the 1964 Summer Olympics.
5 Ron Lyle
6 Rocky Marciano
7 Jerry Quarry
8 Sonny Liston
9 Larry Holmes
10 Jake Lamotta
Giacobbe "Jake" LaMotta was an American professional boxer, world middleweight champion, and stand-up comedian.
11 Manny Pacquiao
Emmanuel Dapidran Pacquiao is a Filipino professional boxer and politician, currently serving as a Senator of the Philippines. He currently ranks #4 in BoxRec's ranking of the greatest pound for pound boxers of all time.
Never been knocked out.
12 Deontay Wilder
Deontay Leshun Wilder is an American professional boxer. He has held the WBC heavyweight title since 2015, and in doing so became the first American world heavyweight champion in nine years, which was the longest period of time in boxing history without an American heavyweight champion.
Toughest fighter you'll ever see.
Eats punches like nothing.
13 Floyd Mayweather Jr.
Floyd Joy Mayweather Jr. is an American former professional boxer and current boxing promoter. ...read more.
Greatest of all time - lucaskt
14 Antonio Tarver
15 Vasyl Lomachenko
16 Amir Khan
17 Tommy Hearns
18 Lennox Lewis
19 Kevin Kelley
20 Gennady Golovkin
Never been down in a professional or amateur fight. - Onetime