11. Floyd Mayweather
> Sport: Boxing
> Championships: 9x world champion, 22x world title defense
> Team or country: United States
> Career length: 1996-2017
> Other accomplishments: 50-0 record, 3x Fighter of the Year
Floyd Mayweather amassed an amazing 50-0 record as a professional boxer, claiming championships in five different weight classes. He defended his world titles 22 times. After his August 2017 fight with Conor McGregor, it is estimated that Mayweather has made over $1 billion in his career.
12. Georges St. Pierre
> Sport: MMA
> Championships: 2x champion, 9x title defense
> Team or country: Canada
> Career length: 2002-present
> Other accomplishments: 26-2 lifetime record
Georges St. Pierre’s UFC career record of 26-2 includes two championships and nine successful defenses of those titles. Unfortunately, the future of the Canadian fighter’s career is now uncertain. He recently announced he is battling colitis and it is unclear if he will fight again.
13. Jimmie Johnson
> Sport: NASCAR
> Championships: 7x NASCAR Cup Series
> Team or country: Hendrick Motorsports
> Career length: 2001-present
> Other accomplishments: 83 races won
Jimmie Johnson had a streak of dominance unprecedented in NASCAR history. Johnson won seven championships in 11 years, including five straight Monster Energy NASCAR Cup Series from 2006-2010.
14. Jonathan Toews
> Sport: Hockey
> Championships: 3x Stanley Cup, 2x gold medal
> Team or country: Chicago Blackhawks
> Career length: 2007-present
> Other accomplishments: 1x All-Star
Jonathan Toews had one of the most remarkable stretches in hockey starting in 2010. In the span of six years, he won three Stanley Cups and two Olympic gold medals with team Canada.
15. Kobe Bryant
> Sport: Basketball
> Championships: 5x NBA Champion, 2x gold medal
> Team or country: Los Angeles Lakers
> Career length: 1996-2016
> Other accomplishments: 18x All-Star, 11x All-NBA, 1x MVP
Kobe Bryant helped continue the Los Angeles Lakers’ victorious ways, winning three straight titles in the early 2000s and two more in 2009 and 2010.