National Basketball Association
The National Basketball Association (NBA) is a professional basketball league in North America composed of 30 teams. It is one of the major professional sports leagues in the United States and Canada and is considered the premier professional basketball league in the world.
Bill Russell defending against Wilt Chamberlain in 1966.
Michael Jordan became the league's most popular player during the 1990s, while leading the Chicago Bulls to six championships.
Tim Duncan led the San Antonio Spurs to five NBA championships between 1999 and 2014.
Kobe Bryant defending LeBron James in a February 2016 game between the Los Angeles Lakers and the Cleveland Cavaliers
In professional sports, as opposed to amateur sports, participants receive payment for their performance. Professionalism in sport has come to the fore through a combination of developments. Mass media and increased leisure have brought larger audiences, so that sports organizations or teams can command large incomes. As a result, more sportspeople can afford to make sport their primary career, devoting the training time necessary to increase skills, physical condition, and experience to modern levels of achievement. This proficiency has also helped boost the popularity of sports. In most sports played professionally there are many more amateur than professional players, though amateurs and professionals do not usually compete.
Professional athletes like footballers Cristiano Ronaldo and Lionel Messi receive salaries that come from corporate sponsors that advertise on their uniforms or around the sporting venue, as well as from the fans who pay money to attend the game
Andy Murray and Laura Robson, professional athletes competing in the tennis mixed doubles event at the 2012 Summer Olympics.
Liverpool Footballer Steven Gerrard preparing to strike the ball, 2005