This is a possible concise summary:
The text is a biography of Floyd Mayweather, a retired American boxer who had an undefeated record of 50 wins and zero losses. It covers his early life, his amateur and professional career, his achievements in different weight classes, his rivalries and controversies, his business ventures and his exhibition fights. It also describes his style, skills, personality and legacy in the sport of boxing.
Here are some possible key facts extracted from the text:
1. Floyd Mayweather is a retired boxer who has won 50 fights and became a champion of five weight classes.
2. Mayweather's father and uncles were also boxers, but his father was involved in drug dealing and was shot and imprisoned.
3. Mayweather learned the Philadelphia defense from his father, which helped him avoid many blows and keep his face intact.
4. Mayweather won his first title at 21 against Genaro Hernandez, who died of cancer years later and whose funeral Mayweather paid for.
5. Mayweather had a controversial victory over Jose Luis Castillo in 2002, but won the rematch convincingly.
6. Mayweather retired for the first time in 2007 after beating Oscar De La Hoya, but returned in 2009 and fought Manny Pacquiao in 2015, the most anticipated and lucrative fight of the decade.
7. Mayweather has built his own brand around money and luxury, and has been involved in domestic violence cases and legal disputes with promoters.
8. Mayweather has fought in exhibition matches against non-boxers such as Conor McGregor, Tenshin Nasukawa and Logan Paul.