Professional Boxing Record
| 58 Wins (44 Knockouts), 9 Defeats, 1 Draw | |||||||
| Res. | Record | Opponent | Type | Rd., Time | Date | Location | Notes |
| Win | 58-9-1 | Billy Joiner | UD | 10 | 1976-02-26 | Reno, Nevada | |
| Win | 57-9-1 | Reinaldo Gorosito | PTS | 10 | 1975-11-01 | Luna Park, Buenos Aires | |
| Win | 56-9-1 | Mani Vaka | TKO | 5 (10) | 1974-11-12 | International Center Arena, Honolulu | |
| Win | 55-9-1 | Oliver Wright | KO | 9 (10) | 1974-10-18 | Rome, Lazio | |
| Win | 54-9-1 | Bob Mashburn | KO | 2 (10) | 1974-09-21 | Rome, Lazio | |
| Win | 53-9-1 | Larry Renaud | KO | 3 (10) | 1974-07-13 | Rome, Lazio | |
| Win | 52-9-1 | Larry Middleton | UD | 12 | 1974-05-21 | Capitol Centre, Largo, Maryland | |
| Loss | 51-9-1 | Ron Lyle | UD | 12 | 1974-03-19 | Denver, Colorado | |
| Win | 51-8-1 | Terry Sorrell | TKO | 2 (8) | 1973-11-20 | Oklahoma City, Oklahoma | |
| Win | 50-8-1 | Lou Bailey | UD | 10 | 1973-08-15 | Denver, Colorado | |
| Win | 49-8-1 | Roy Wallace | TKO | 6 (10) | 1973-08-06 | Las Vegas, Nevada | |
| Win | 48-8-1 | Leroy Caldwell | TKO | 2 (10) | 1973-07-23 | Circus Circus Hotel, Las Vegas, Nevada | |
| Loss | 47-8-1 | Floyd Patterson | UD | 10 | 1972-02-11 | Madison Square Garden, New York City, New York | |
| Win | 47-7-1 | Alvin Lewis | DQ | 7 (10) | 1971-10-04 | Luna Park, Buenos Aires | |
| Loss | 46-7-1 | Muhammad Ali | TKO | 15 | 1970-12-07 | Madison Square Garden, New York City, New York | NABF Heavyweight title fight. |
| Win | 46-6-1 | Luis Pires | RTD | 8 (10) | 1970-10-29 | Luna Park, Buenos Aires | |
| Win | 45-6-1 | James J Woody | KO | 5 (10) | 1970-07-04 | Luna Park, Buenos Aires | |
| Win | 44-6-1 | Manuel Ramos | KO | 1 (10) | 1970-05-09 | Luna Park, Buenos Aires | |
| Win | 43-6-1 | José Menno | KO | 2 (8) | 1970-04-24 | Montevideo, Montevideo | |
| Win | 42-6-1 | Santiago Lovell | KO | 7 (10) | 1970-03-21 | Luna Park, Buenos Aires | |
| Loss | 41-6-1 | Miguel Angel Paez | DQ | 7 (10) | 1970-01-10 | Luna Park, Buenos Aires | |
| Win | 41-5-1 | Santiago Lovell | TKO | 8 (10) | 1969-12-13 | Luna Park, Buenos Aires | |
| Draw | 40-5-1 | Gregorio Peralta | PTS | 10 | 1969-08-08 | Palacio Peñarol, Montevideo, Montevideo | |
| Win | 40-5 | Wilhelm Von Homburg | TKO | 3 (10) | 1969-06-20 | Sportpalast, Berlin | |
| Win | 39-5 | Luis Pires | RTD | 8 (10) | 1969-03-05 | Mar del Plata, Buenos Aires | |
| Loss | 38-5 | Joe Frazier | UD | 15 | 1968-12-10 | Spectrum, Philadelphia, Pennsylvania | NYSAC Heavyweight title fight. |
| Win | 38-4 | Jim Fletcher | KO | 1 (10) | 1968-11-09 | Luna Park, Buenos Aires | |
| Win | 37-4 | Leotis Martin | UD | 10 | 1968-09-07 | Luna Park, Buenos Aires | |
| Win | 36-4 | Zora Folley | MD | 10 | 1968-07-06 | Luna Park, Buenos Aires | |
| Win | 35-4 | Roberto Davila | UD | 10 | 1968-06-01 | Luna Park, Buenos Aires | |
| Win | 34-4 | Lee Carr | KO | 3 (10) | 1968-04-20 | Luna Park, Buenos Aires | |
| Win | 33-4 | Alberto Benassi | KO | 3 (10) | 1968-03-08 | La Rioja, La Rioja | |
| Win | 32-4 | Felipe Pedro Marich | TKO | 6 (10) | 1968-02-16 | Córdoba, Córdoba | |
| Loss | 31-4 | Jimmy Ellis | UD | 12 | 1967-12-02 | Freedom Hall, Louisville, Kentucky | WBA Heavyweight title eliminator. |
| Win | 31-3 | Karl Mildenberger | UD | 12 | 1967-09-16 | Waldstadion, Frankfurt, Hesse | WBA Heavyweight title eliminator. |
| Win | 30-3 | Carlos Vazquez | TKO | 3 (10) | 1967-08-05 | General Roca, Río Negro | |
| Win | 29-3 | Luis Pires | RTD | 6 (10) | 1967-07-22 | Luna Park, Buenos Aires | |
| Win | 28-3 | Pablo Sagrispanti | KO | 2 (10) | 1967-06-23 | Luna Park, Buenos Aires | |
| Win | 27-3 | Hubert Hilton | TKO | 10 | 1967-04-08 | Luna Park, Buenos Aires | |
| Win | 26-3 | Jose Giorgetti | KO | 9 (10) | 1967-01-21 | Estadio Bristol, Mar del Plata, Buenos Aires | |
| Win | 25-3 | Roberto Veliz | KO | 4 (10) | 1966-12-01 | Asociación Mendocina de Boxeo, Mendoza, Mendoza | |
| Win | 24-3 | Alberto Benassi | TKO | 5 (10) | 1966-11-18 | Rosario, Santa Fe | |
| Win | 23-3 | Amos Johnson | UD | 10 | 1966-10-22 | Luna Park, Buenos Aires | |
| Win | 22-3 | Alberto Benassi | KO | 5 (10) | 1966-10-07 | Estadio Bristol, Mar del Plata, Buenos Aires | |
| Loss | 21-3 | Joe Frazier | MD | 10 | 1966-09-21 | Madison Square Garden, New York City, New York | Lost the Argentinian Heavyweight title. |
| Win | 21-2 | George Chuvalo | MD | 10 | 1966-06-23 | Madison Square Garden, New York City, New York | |
| Win | 20-2 | Jose Giorgetti | UD | 10 | 1966-04-16 | Luna Park, Buenos Aires | |
| Loss | 19-2 | Jose Giorgetti | DQ | 8 (10) | 1966-03-12 | Estadio Bristol, Mar del Plata, Buenos Aires | |
| Win | 19-1 | Bruno Segura | KO | 2 (10) | 1966-02-12 | Mar del Plata, Buenos Aires | |
| Win | 18-1 | Billy Daniels | KO | 1 (10) | 1965-11-13 | Luna Park, Buenos Aires | |
| Win | 17-1 | Hector Wilson | KO | 2 (10) | 1965-10-22 | Concepción, Tucumán | |
| Win | 16-1 | Pablo Sagrispanti | TKO | 1 (10) | 1965-10-09 | Rosario, Santa Fe | |
| Win | 15-1 | Gregorio Peralta | UD | 12 | 1965-09-04 | Luna Park, Buenos Aires | Won Argentinian Heavyweight title. |
| Win | 14-1 | Alberto Gonzales | KO | 2 (10) | 1965-08-06 | Comodoro Rivadavia, Chubut | |
| Win | 13-1 | Eduardo Cartelli | KO | 1 (12) | 1965-07-23 | Córdoba, Córdoba | |
| Win | 12-1 | Rodolfo Diaz | TKO | 4 (10) | 1965-06-26 | Luna Park, Buenos Aires | |
| Win | 11-1 | Rogelio Gregorutti | KO | 2 (10) | 1965-05-28 | San Miguel de Tucumán, Tucumán | |
| Win | 10-1 | Carlos Vazquez | KO | 3 (10) | 1965-04-30 | Salón de los Deportes, Bahía Blanca, Buenos Aires | |
| Win | 9-1 | Rene Sosa | KO | 2 (10) | 1965-04-16 | Mar del Plata, Buenos Aires | |
| Loss | 8-1 | Zora Folley | UD | 10 | 1965-02-26 | Madison Square Garden, New York City, New York | |
| Win | 8-0 | Billy Stephan | TKO | 6 (10) | 1964-12-18 | Madison Square Garden, New York City, New York | |
| Win | 7-0 | Dick Wipperman | UD | 10 | 1964-11-13 | Madison Square Garden, New York City, New York | |
| Win | 6-0 | Tom McNeeley | TKO | 5 (8) | 1964-08-21 | Madison Square Garden, New York City, New York | |
| Win | 5-0 | Byron Stoimenides | KO | 1 (8) | 1964-05-29 | Madison Square Garden, New York City, New York | |
| Win | 4-0 | Leslie Borden | TKO | 3 (10) | 1964-05-05 | Sunnyside Garden, Queens, New York | |
| Win | 3-0 | Wendell Newton | TKO | 5 (6) | 1964-03-10 | Sunnyside Garden, Queens, New York | |
| Win | 2-0 | Everett Copeland | KO | 1 (6) | 1964-02-04 | Sunnyside Garden, Queens, New York | |
| Win | 1-0 | Lou Hicks | TKO | 1 (4) | 1964-01-03 | Madison Square Garden, New York City, New York | |
Read more about this topic: Oscar Bonavena
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