<Table> <Tr> <Th> Boxer </Th> <Th> Record </Th> <Th> Weight class </Th> <Th> Title ( s ) </Th> <Th> Championship years </Th> <Th> Title defenses </Th> <Th> Notes </Th> </Tr> <Tr> <Td> Jimmy Barry </Td> <Td> 59 -- 0 -- 9 ( 2 ) </Td> <Td> Bantamweight </Td> <Td> World </Td> <Td> 1894 -- 1899 </Td> <Td> 6 ( 3 draws ) </Td> <Td> </Td> </Tr> <Tr> <Td> Joe Calzaghe </Td> <Td> 46 -- 0 -- 0 ( 0 ) </Td> <Td> Super middleweight </Td> <Td> WBO </Td> <Td> 1997 -- 2008 </Td> <Td> 21 </Td> <Td> Vacated title to move up to light heavyweight . </Td> </Tr> <Tr> <Td> IBF </Td> <Td> 2006 </Td> <Td> </Td> <Td> Vacated title to fight Peter Manfredo Jr. instead of # 1 contender Robert Stieglitz . </Td> </Tr> <Tr> <Td> The Ring , lineal </Td> <Td> 2006 -- 2008 </Td> <Td> </Td> <Td> Vacated titles to move up to light heavyweight . </Td> </Tr> <Tr> <Td> WBA , WBC </Td> <Td> 2007 -- 2008 </Td> <Td> 0 </Td> </Tr> <Tr> <Td> Light heavyweight </Td> <Td> The Ring </Td> <Td> 2008 </Td> <Td> </Td> <Td> Retired and vacated title . </Td> </Tr> <Tr> <Td> Kim Ji - won </Td> <Td> 16 -- 0 -- 2 ( 0 ) </Td> <Td> Super bantamweight </Td> <Td> IBF </Td> <Td> 1985 -- 1986 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Mihai Leu </Td> <Td> 28 -- 0 -- 0 ( 0 ) </Td> <Td> Welterweight </Td> <Td> WBO </Td> <Td> </Td> <Td> </Td> <Td> Retired from boxing due to an injury . </Td> </Tr> <Tr> <Td> Ricardo López </Td> <Td> 51 -- 0 -- 1 ( 0 ) </Td> <Td> Minimumweight </Td> <Td> WBC </Td> <Td> 1990 -- 1998 </Td> <Td> 22 </Td> <Td> Vacated title to move up to light flyweight . </Td> </Tr> <Tr> <Td> WBO </Td> <Td> 1997 -- 1998 </Td> <Td> 0 </Td> <Td> Unified WBC and WBO titles . Stripped of WBO title for saying he wanted to give the belt to his father . </Td> </Tr> <Tr> <Td> WBA </Td> <Td> 1998 </Td> <Td> 0 </Td> <Td> Vacated title to move up to junior flyweight . </Td> </Tr> <Tr> <Td> Light flyweight </Td> <Td> IBF </Td> <Td> 1999 -- 2002 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Rocky Marciano </Td> <Td> 49 -- 0 -- 0 ( 0 ) </Td> <Td> Heavyweight </Td> <Td> World </Td> <Td> 1952 -- 1956 </Td> <Td> 6 </Td> <Td> </Td> </Tr> <Tr> <Td> Terry Marsh </Td> <Td> 26 -- 0 -- 1 ( 0 ) </Td> <Td> Light welterweight </Td> <Td> IBF </Td> <Td> </Td> <Td> </Td> <Td> Retired from boxing due to epilepsy . </Td> </Tr> <Tr> <Td> Floyd Mayweather Jr . </Td> <Td> 50 -- 0 -- 0 ( 0 ) </Td> <Td> Super featherweight </Td> <Td> WBC </Td> <Td> 1998 -- 2002 </Td> <Td> 8 </Td> <Td> Vacated title to move up to lightweight . </Td> </Tr> <Tr> <Td> Lightweight </Td> <Td> WBC </Td> <Td> 2002 -- 2004 </Td> <Td> </Td> <Td> Vacated title to move up to light welterweight . </Td> </Tr> <Tr> <Td> Light welterweight </Td> <Td> WBC </Td> <Td> 2005 -- 2006 </Td> <Td> 0 </Td> <Td> Vacated title to move up to welterweight . </Td> </Tr> <Tr> <Td> Welterweight </Td> <Td> WBA , WBC </Td> <Td> 2006 -- 2008 , 2011 -- 2015 </Td> <Td> 8 </Td> <Td> Retired at 49 -- 0 in 2015 ; returned in 2017 for non-title McGregor fight and then retired again . </Td> </Tr> <Tr> <Td> Light middleweight </Td> <Td> WBA , WBC </Td> <Td> 2007 , 2012 -- 2015 , 2017 </Td> <Td> </Td> </Tr> <Tr> <Td> Jack McAuliffe </Td> <Td> 30 -- 0 -- 5 ( 1 ) </Td> <Td> Lightweight </Td> <Td> World </Td> <Td> 1886 -- 1893 </Td> <Td> 7 -- 0 -- 2 ( 0 ) </Td> <Td> </Td> </Tr> <Tr> <Td> Sven Ottke </Td> <Td> 34 -- 0 -- 0 ( 0 ) </Td> <Td> Super middleweight </Td> <Td> IBF </Td> <Td> 1998 -- 2004 </Td> <Td> 21 </Td> <Td> </Td> </Tr> <Tr> <Td> WBA </Td> <Td> 2003 -- 2004 </Td> <Td> </Td> <Td> Defended IBF title and defeated WBA champion to become WBA Super champion . </Td> </Tr> <Tr> <Td> Dmitry Pirog </Td> <Td> 20 -- 0 -- 0 ( 0 ) </Td> <Td> Middleweight </Td> <Td> WBO </Td> <Td> 2010 -- 2012 </Td> <Td> </Td> <Td> Retired from boxing due to chronic back injuries . </Td> </Tr> <Tr> <Td> Harry Simon </Td> <Td> 30 -- 0 -- 0 ( 0 ) </Td> <Td> Light middleweight </Td> <Td> WBO </Td> <Td> 1998 -- 2001 </Td> <Td> </Td> <Td> Vacated title to move up to middleweight . </Td> </Tr> <Tr> <Td> Middleweight </Td> <Td>
<Table> <Tr> <Th> Boxer </Th> <Th> Record </Th> <Th> Weight class </Th> <Th> Title ( s ) </Th> <Th> Championship years </Th> <Th> Title defenses </Th> <Th> Notes </Th> </Tr> <Tr> <Td> Jimmy Barry </Td> <Td> 59 -- 0 -- 9 ( 2 ) </Td> <Td> Bantamweight </Td> <Td> World </Td> <Td> 1894 -- 1899 </Td> <Td> 6 ( 3 draws ) </Td> <Td> </Td> </Tr> <Tr> <Td> Joe Calzaghe </Td> <Td> 46 -- 0 -- 0 ( 0 ) </Td> <Td> Super middleweight </Td> <Td> WBO </Td> <Td> 1997 -- 2008 </Td> <Td> 21 </Td> <Td> Vacated title to move up to light heavyweight . </Td> </Tr> <Tr> <Td> IBF </Td> <Td> 2006 </Td> <Td> </Td> <Td> Vacated title to fight Peter Manfredo Jr. instead of # 1 contender Robert Stieglitz . </Td> </Tr> <Tr> <Td> The Ring , lineal </Td> <Td> 2006 -- 2008 </Td> <Td> </Td> <Td> Vacated titles to move up to light heavyweight . </Td> </Tr> <Tr> <Td> WBA , WBC </Td> <Td> 2007 -- 2008 </Td> <Td> 0 </Td> </Tr> <Tr> <Td> Light heavyweight </Td> <Td> The Ring </Td> <Td> 2008 </Td> <Td> </Td> <Td> Retired and vacated title . </Td> </Tr> <Tr> <Td> Kim Ji - won </Td> <Td> 16 -- 0 -- 2 ( 0 ) </Td> <Td> Super bantamweight </Td> <Td> IBF </Td> <Td> 1985 -- 1986 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Mihai Leu </Td> <Td> 28 -- 0 -- 0 ( 0 ) </Td> <Td> Welterweight </Td> <Td> WBO </Td> <Td> </Td> <Td> </Td> <Td> Retired from boxing due to an injury . </Td> </Tr> <Tr> <Td> Ricardo López </Td> <Td> 51 -- 0 -- 1 ( 0 ) </Td> <Td> Minimumweight </Td> <Td> WBC </Td> <Td> 1990 -- 1998 </Td> <Td> 22 </Td> <Td> Vacated title to move up to light flyweight . </Td> </Tr> <Tr> <Td> WBO </Td> <Td> 1997 -- 1998 </Td> <Td> 0 </Td> <Td> Unified WBC and WBO titles . Stripped of WBO title for saying he wanted to give the belt to his father . </Td> </Tr> <Tr> <Td> WBA </Td> <Td> 1998 </Td> <Td> 0 </Td> <Td> Vacated title to move up to junior flyweight . </Td> </Tr> <Tr> <Td> Light flyweight </Td> <Td> IBF </Td> <Td> 1999 -- 2002 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Rocky Marciano </Td> <Td> 49 -- 0 -- 0 ( 0 ) </Td> <Td> Heavyweight </Td> <Td> World </Td> <Td> 1952 -- 1956 </Td> <Td> 6 </Td> <Td> </Td> </Tr> <Tr> <Td> Terry Marsh </Td> <Td> 26 -- 0 -- 1 ( 0 ) </Td> <Td> Light welterweight </Td> <Td> IBF </Td> <Td> </Td> <Td> </Td> <Td> Retired from boxing due to epilepsy . </Td> </Tr> <Tr> <Td> Floyd Mayweather Jr . </Td> <Td> 50 -- 0 -- 0 ( 0 ) </Td> <Td> Super featherweight </Td> <Td> WBC </Td> <Td> 1998 -- 2002 </Td> <Td> 8 </Td> <Td> Vacated title to move up to lightweight . </Td> </Tr> <Tr> <Td> Lightweight </Td> <Td> WBC </Td> <Td> 2002 -- 2004 </Td> <Td> </Td> <Td> Vacated title to move up to light welterweight . </Td> </Tr> <Tr> <Td> Light welterweight </Td> <Td> WBC </Td> <Td> 2005 -- 2006 </Td> <Td> 0 </Td> <Td> Vacated title to move up to welterweight . </Td> </Tr> <Tr> <Td> Welterweight </Td> <Td> WBA , WBC </Td> <Td> 2006 -- 2008 , 2011 -- 2015 </Td> <Td> 8 </Td> <Td> Retired at 49 -- 0 in 2015 ; returned in 2017 for non-title McGregor fight and then retired again . </Td> </Tr> <Tr> <Td> Light middleweight </Td> <Td> WBA , WBC </Td> <Td> 2007 , 2012 -- 2015 , 2017 </Td> <Td> </Td> </Tr> <Tr> <Td> Jack McAuliffe </Td> <Td> 30 -- 0 -- 5 ( 1 ) </Td> <Td> Lightweight </Td> <Td> World </Td> <Td> 1886 -- 1893 </Td> <Td> 7 -- 0 -- 2 ( 0 ) </Td> <Td> </Td> </Tr> <Tr> <Td> Sven Ottke </Td> <Td> 34 -- 0 -- 0 ( 0 ) </Td> <Td> Super middleweight </Td> <Td> IBF </Td> <Td> 1998 -- 2004 </Td> <Td> 21 </Td> <Td> </Td> </Tr> <Tr> <Td> WBA </Td> <Td> 2003 -- 2004 </Td> <Td> </Td> <Td> Defended IBF title and defeated WBA champion to become WBA Super champion . </Td> </Tr> <Tr> <Td> Dmitry Pirog </Td> <Td> 20 -- 0 -- 0 ( 0 ) </Td> <Td> Middleweight </Td> <Td> WBO </Td> <Td> 2010 -- 2012 </Td> <Td> </Td> <Td> Retired from boxing due to chronic back injuries . </Td> </Tr> <Tr> <Td> Harry Simon </Td> <Td> 30 -- 0 -- 0 ( 0 ) </Td> <Td> Light middleweight </Td> <Td> WBO </Td> <Td> 1998 -- 2001 </Td> <Td> </Td> <Td> Vacated title to move up to middleweight . </Td> </Tr> <Tr> <Td> Middleweight </Td> <Td>
who has the most undefeated record in boxing
who has the most undefeated record in boxing
Jimmy Barry
Jimmy Barry