<Tr> <Td> Middleweight </Td> <Td> WBO </Td> <Td> 2002 </Td> <Td> 0 </Td> <Td> Won WBO interim middleweight title in 2001 and the outright title in 2002 . Stripped of title at 29--0 when he was unable to defend it due to injuries suffered in a car crash . Had one more non-title fight before retiring . </Td> </Tr> <Tr> <Td> Pichit Sitbangprachan </Td> <Td> 24--0--0 (0) </Td> <Td> Flyweight </Td> <Td> IBF </Td> <Td> 1992--1994 </Td> <Td> </Td> <Td> Retired at 21--0 and then made a comeback . </Td> </Tr> <Tr> <Td> Edwin Valero </Td> <Td> 27--0--0 (0) </Td> <Td> Super featherweight </Td> <Td> WBA </Td> <Td> 2006--2008 </Td> <Td> </Td> <Td> Vacated title to move up to lightweight . </Td> </Tr> <Tr> <Td> Lightweight </Td> <Td> WBC </Td> <Td> 2009--2010 </Td> <Td> </Td> <Td> Vacated title to move up to light welterweight . Committed suicide after allegedly killing his wife in 2010 . All 27 fights were knockout wins . </Td> </Tr>

Who holds the best record in boxing history