Roger L. Mayweather (April 24, 1961 – March 17, 2020)^[2] was an American professional boxer who competed from 1981 to 1999 and later on a boxing trainer. He was a two-division world champion, having held the WBA and The Ring super featherweight titles from 1983 to 1984, and the WBC light welterweight title from 1987 to 1989. Additionally he held the IBO light welterweight title in 1994, and the IBO welterweight title from 1994 to 1995.

Mayweather served as the trainer for his nephew, Floyd Mayweather Jr., from 2000 to 2012. Under Roger's guidance, Floyd Jr. became one of the biggest names in the sport of boxing and one of the pound for pound greats.

When asked about his ring nickname, Roger stated:

"It's funny because I wanted a boxing nickname that wouldn’t be common to most people. One day when I was flipping through channels and I came upon this channel showing different reptiles, and they were showing the black mamba, one of the most deadly snakes in the world. I loved the way the mamba attacked so quietly, but when he hit you he just hit you one time and the poison was in you. That reminded me of myself right there."^[4]

When Floyd Mayweather Jr. turned pro in 1996, Roger Mayweather turned his attention away from his own competitive boxing career and focused more on being the younger Mayweather's trainer. Roger trained Floyd Jr. until early 1998, when Floyd Mayweather Sr. was released from prison and became Mayweather Jr's trainer. However, soon after Mayweather defeated Gregorio Vargas on March 18, 2000, Mayweather Jr. fired Mayweather Sr. as his trainer and brought uncle Roger back.

Roger Mayweather garnered national attention during and after Floyd Mayweather Jr. vs. Zab Judah on April 8, 2006. Near the conclusion of the tenth round, Judah hit Mayweather with a left hand that was clearly below the belt and followed up with a right-handed rabbit punch. After referee Richard Steele called time with five seconds remaining in the round, Roger Mayweather entered the ring, but was restrained by Steele. Judah's father and trainer, Yoel Judah, entered the ring and swung at Roger. Zab then went after Roger—taking a swing and grappling with him until security broke it up and cleared the ring. Roger was ejected, but the boxers finished the remaining two rounds, and Mayweather won by unanimous decision. Five days after the fight, the Nevada State Athletic Commission decided not to overturn the result of the bout, but Roger Mayweather was fined US $200,000 and suspended for one year.^[5]

Mayweather was arrested in August 2009 in Las Vegas for allegedly attacking one of his former boxers, female boxer Melissa St. Vil. Mayweather allegedly hit her several times in the ribs, then tried to choke her, causing her to spit up blood when police arrived. Appearing on the HBO series 24/7, Mayweather admitted to choking St. Vil in an effort to restrain her, but denied that he physically struck her.^[6]

Mayweather was born in Grand Rapids, Michigan, the son of Bernice (Ambrose) and Theartha Mayweather.^[7][8] He is a part of the Mayweather boxing family: his brothers are Floyd Mayweather Sr. and Jeff Mayweather, and his nephew is Floyd Mayweather Jr.

Mayweather died on March 17, 2020, in Las Vegas, Nevada at age 58, after years of deteriorating health. Floyd opened up about Roger's health back in 2015, and thinks that boxing is the main cause of it.

He did not specify the cause, but said his uncle's “health was failing him for several years.” Roger Mayweather had a number of long-term health problems, including diabetes.^[9]

"My uncle Roger Mayweather has lost a lot of memory from the sport of boxing, he's only in his 50s, but it seems like he's an old man in his 80s." Floyd said.^[10][11]

• List of world super-featherweight boxing champions
• List of world light-welterweight boxing champions
• List of boxing families