Who is most respected for giving the man ranked as the sixth best active boxer one of the toughest fights of his career?
Guillermo Rigondeaux Guillermo Rigondeaux Ortiz (] ; born September 30, 1980) is a Cuban professional boxer. He has held multiple world championships at super bantamweight, including the WBA (Super) and lineal titles since 2013, and previously the WBO and "Ring" magazine titles between 2013 and 2016. As of May 2017, Rigondeaux is ranked as the world's best super bantamweight by "The Ring", the Transnational Boxing Rankings Board, and BoxRec; "The Ring" also ranks him as the sixth best active boxer, pound for pound.
Jack Blackburn Charles Henry "Jack" Blackburn (May 20, 1883 – April 24, 1942) was an American boxer and boxing trainer. Fighting in the first half of his career as a lightweight and later a welterweight, he was known for an exceptional defense and fought many men above his weight class, including six bouts with the great Sam Langford. He fought Joe Gans three times in no-decision bouts, defeating him once according to newspaper accounts and made good showings against Harry Lewis, Philadelphia Jack O'Brien, and Harry Greb. He found most of his fame training 1937 World Heavyweight Champion Joe Louis, but also had a significant role in training 1926 Lightweight Champion Sammy Mandell. He helped to train World Bantamweight Champion Bud Taylor and World Light-Heavyweight Champion John Henry Lewis.