Ring's Top one-punch KO artists

All Time
1. Joe Louis
2. Ray Robinson
3. Thomas Hearns
4. Bob Foster
5. Sandy Saddler
6. Earnie Shavers
7. Sam Langford
8. Stanley Ketchel
9. Jack Dempsey
10. Mike Tyson

Honorable mention: Rocky Marciano, Max Baer, Sonny Liston, Rocky Graziano, Bob Fitzsimmons, Jimmy Wilde, George Foreman, Alexis Arguello, Julian Jackson, Danny Lopez, Carlos Zarate, Wilfredo Gomez and Ruben Olivares.

Current
1. Nonito Donaire
2. Marcos Maidana
3. Juan Manuel Lopez
4. Jhonny Gonzalez
5. Wladimir Klitschko
6. Sergio Martinez
7. Lucian Bute
8. Roman Gonzalez
9. Gennady Golovkin
10. James Kirkland

Honorable mention:Arthur Abraham, Alfredo Angulo, Randall Bailey, Vic Darchinyan, Yuriorkis Gamboa, Zab Judah, Lucas Matthysse, Toshiaki Nishioka, Victor Ortiz, Manny Pacquiao, Giovani Segura and David Tua.

http://ringtv.craveonline.com/blog/172143-packing-power-top-one-punch-ko-artists-today