Professional athletes rake in tons of money every year for playing the game they love.
But the real money comes when you own the show.
Forbes put out its annual Billionaires list on Monday and the billionaires of the sports world aren't out there on the field, they're the ones behind the scenes.
#2 Malcolm Glazer
Net worth: $4.4 billion
Glazer owns not one, but two sports teams. Glazer bought the NFL's Tampa Bay Buccaneers in 1995, and the EPL soccer team Manchester United.
Manchester United went public in August 2012 and became the first sports team to ever be valued at more than $3 billion in January 2013.
#3 Bernie Eccelstone (and family)
Net Worth: $3.8 billion
Bernie Ecclestone owns 5.3% of Formula One, an elite car racing league in the U.K. Ecclestone turned Formula One into a popular sport across the globe.
Much of his fortune is sitting in trust funds for his daughters Petra and Tamara.
#4 Jerry Jones
Net worth: $2.7 billion
Jerry Jones has been the owner of the Dallas Cowboys since 1989. The Cowboys are the most valuable sports team in the United States worth $2.1 billion. After making a fortune in the 1970's in natural gas, Jones bought the cowboys for just $150 million in 1989.
He also owns the Cowboys' stadium.
#5 Robert Kraft
Net worth: $2.3 billion
Robert Kraft bought the New England Patriots in 1995 for $172 million.
Kraft is also the Chairman and CEO of The Kraft Group, which owns real estate, paper companies, and the New England Revolution.
#6 Stephen Bisciotti
Net worth: $1.8 billion
Stephen Bisciotti owns the Baltimore Ravens, he bought controlling interest of the football team in 2004. Bisciotti made his fortune founding an engineering staffing firm called Aerotek, now called Allegis Group.
#7 Robert McNair
Net worth: $1.8 billion
Robert McNair is responsible for bringing the NFL back to Houston. McNair brought the Texans to Houston in 2002. The Texans are worth $1.3 billion.
McNair sold Cogen Technologies to Enron for $1.5 billion just before the tech bubble.
#8 Arthur Blank
Net worth: $1.6 billion
Arthur Blank is the founder of Home Depot. Blank also owns the Atlanta Falcons.
#10 John Henry
Net worth: $1.5 billion
John Henry bought the Red Sox in 2002, he also owns Liverpool FC. Henry made his fortune from his hedge fun J.W. Henry and Company.