

Sources
www.forbes.com/athletes/
www.sportingintelligence.com/2012/05/01/revealed-the-worlds-best-paid-teams-man-city-close-in-on-barca-and-real-madrid-010501/
www.dailymail.co.uk/sport/football/article-2055140/Premier-League-wages-FIVE-times-Championship.html
http://money.uk.msn.com/news/money-in-sport/articles.aspx?cp-documentid=154629146
www.telegraph.co.uk/sport/rugbyunion/international/england/9807267/England-to-be-best-paid-team-at-2015-World-Cup.html
http://work.chron.com/average-salary-professional-tennis-players-6052.html