[1] He gave Honda their first-ever super bike victory when he won the Road America round of the 1980 AMA Superbike Championship.

[1] Spencer gained international prominence at the 1980 U.S. versus Britain Transatlantic Trophy match races when he won two legs at Brands Hatch, defeating World Champions Kenny Roberts and Barry Sheene in the process.

In 1983, Spencer won his first 500cc World Championship at the age of 21, becoming the youngest person to win the title, a distinction previously held by Mike Hailwood.

[3] The 1983 season would be remembered as one of the most dramatic title chases in the history of Grand Prix racing; Honda's Spencer and Yamaha's Kenny Roberts fought back and forth for the points lead with each of them earning six victories.

Teething problems and injuries from crashes hindered Spencer's defense of his crown and he was relegated to fourth place in the championship.

His career was cut short by wrist injuries that some believe were caused by the physical strain of competing in two championships during a single season.

Spencer had a short stint with the Agostini Yamaha team and ended his career on a Ducati in the US National Championship.

(key) (Races in bold indicate pole position; races in italics indicate fastest lap) 1949  L. Graham 1950  U. Masetti 1951  G. Duke 1952  U. Masetti 1953  G. Duke 1954  G. Duke 1955  G. Duke 1956  J. Surtees 1957  L. Liberati 1958  J. Surtees 1959  J. Surtees 1960  J. Surtees 1961  G. Hocking 1962  M. Hailwood 1963  M. Hailwood 1964  M. Hailwood 1965  M. Hailwood 1966  G. Agostini 1967  G. Agostini 1968  G. Agostini 1969  G. Agostini 1970  G. Agostini 1971  G. Agostini 1972  G. Agostini 1973  P. Read 1974  P. Read 1975  G. Agostini 1976  B. Sheene 1977  B. Sheene 1978  K. Roberts 1979  K. Roberts 1980  K. Roberts 1981  M. Lucchinelli 1982  F. Uncini 1983  F. Spencer 1984  E. Lawson 1985  F. Spencer 1986  E. Lawson 1987  W. Gardner 1988  E. Lawson 1989  E. Lawson 1990  W. Rainey 1991  W. Rainey 1992  W. Rainey 1993  K. Schwantz 1994  M. Doohan 1995  M. Doohan 1996  M. Doohan 1997  M. Doohan 1998  M. Doohan 1999  À. Crivillé 2000  K. Roberts Jr. 2001  V. Rossi 2002  V. Rossi 2003  V. Rossi 2004  V. Rossi 2005  V. Rossi 2006  N. Hayden 2007  C. Stoner 2008  V. Rossi 2009  V. Rossi 2010  J. Lorenzo 2011  C. Stoner 2012  J. Lorenzo 2013  M. Márquez 2014  M. Márquez 2015  J. Lorenzo 2016  M. Márquez 2017  M. Márquez 2018  M. Márquez 2019  M. Márquez 2020  J. Mir 2021  F. Quartararo 2022  F. Bagnaia 2023  F. Bagnaia 2024  J. Martín 1949  B. Ruffo 1950  D. Ambrosini 1951  B. Ruffo 1952  E. Lorenzetti 1953  W. Haas 1954  W. Haas 1955  H. Müller 1956  C. Ubbiali 1957  C. Sandford 1958  T. Provini 1959  C. Ubbiali 1960  C. Ubbiali 1961  M. Hailwood 1962  J. Redman 1963  J. Redman 1964  P. Read 1965  P. Read 1966  M. Hailwood 1967  M. Hailwood 1968  P. Read 1969  K. Carruthers 1970  R. Gould 1971  P. Read 1972  J. Saarinen 1973  D. Braun 1974  W. Villa 1975  W. Villa 1976  W. Villa 1977  M. Lega 1978  K. Ballington 1979  K. Ballington 1980  A. Mang 1981  A. Mang 1982  J. Tournadre 1983  C. Lavado 1984  C. Sarron 1985  F. Spencer 1986  C. Lavado 1987  A. Mang 1988  S. Pons 1989  S. Pons 1990  J. Kocinski 1991  L. Cadalora 1992  L. Cadalora 1993  T. Harada 1994  M. Biaggi 1995  M. Biaggi 1996  M. Biaggi 1997  M. Biaggi 1998  L. Capirossi 1999  V. Rossi 2000  O. Jacque 2001  D. Kato 2002  M. Melandri 2003  M. Poggiali 2004  D. Pedrosa 2005  D. Pedrosa 2006  J. Lorenzo 2007  J. Lorenzo 2008  M. Simoncelli 2009  H. Aoyama 2010  T. Elías 2011  S. Bradl 2012  M. Márquez 2013  P. Espargaró 2014  T. Rabat 2015  J. Zarco 2016  J. Zarco 2017  F. Morbidelli 2018  F. Bagnaia 2019  Á. Márquez 2020  E. Bastianini 2021  R. Gardner 2022  A. Fernández 2023  P. Acosta 2024  A. Ogura Freddie Spencer, Takazumi Katayama, Randy Mamola, Wayne Gardner, Mick Doohan, Daryl Beattie, Àlex Crivillé, Tadayuki Okada Valentino Rossi, Tohru Ukawa, Nicky Hayden, Dani Pedrosa, Andrea Dovizioso, Casey Stoner, Marc Márquez