Tom Brady may be a Super Bowl champion and has, arguably, the most recognizable face in the NFL. 
 
 But worldwide, he's far from the most well-known athlete, according a new ESPN study that ranked him at No. 21 on a list of the most famous athletes in the world 
 
 Brady is the seventh American on the list, behind LeBron James (2), Phil Mickelson (5), Kevin Durant (8), Tiger Woods (10), Stephen Curry (11), Ronda Rousey (16), Jordan Spieth (17) and Serena Williams (19). He came in behind five tennis players, four golfers, three basketball players, four soccer players, one sprinter, one MMA fighter and two cricket players. 
 
 The Patriots quarterback was the top NFL player ranked in the study that compiles data across five different categories -- endorsement money, Twitter followers, Instagram followers, Facebook followers and Google Trends score -- to produce the ranking. 
 
 The ranking is a spike for Brady, who came in at No. 52 and the sixth most famous football player on last year's inaugural list. But he leaped Cam Newton, Peyton Manning (retired), Odell Beckham Jr., Drew Brees and Russell Wilson to jump to 21 on the overall list. Increased endorsements and a new Instagram following, among other factors, seem to have contributed. 
 
 Some other items of note from the list: 
 
 -- The only other Boston tie-in included in the list is U.S. gymnast Aly Raisman, who made it in at No. 99. The Needham native captained last summer's U.S. Olympic team to another team gold medal. 
 
 -- Both Rob Gronkowski (72) and David Ortiz (78) dropped out of this year's list after making it last year. 
 
 -- After eight baseball players and three hockey players cracked last year's list, neither sport was represented on this year's version. 
 
 -- Sixteen NFL players made last year's list, and that number was cut in half. Brady tops the list of eight that includes Cam Newton (47), Drew Brees (52), Russell Wilson (55), Aaron Rodgers (56), Eli Manning (60), Odell Beckham, Jr. (64) and J.J. Watt (74). ||||| ESPN World Fame 100 methodology 
 
 The ESPN World Fame 100 is our annual attempt to create a ranking, through statistical analysis, of the 100 most famous athletes on the planet. 
 
 We started with Forbes' annual list of the highest-paid athletes and expanded the pool from there using a variety of domestic and international sources to make sure we didn't overlook any legitimate candidates. (You can find the 2016 World Fame 100 here.) We also sought input from ESPN journalists around the world, including colleagues in our bureaus in Australia, South Africa, Argentina, Brazil, China, India, Mexico and the United Kingdom. 
 
 The data for each athlete in the pool was then fed into a formula created by ESPN director of sports analytics Ben Alamar that weighs athletes' endorsements, their following on the social media Big Three (Facebook, Twitter and Instagram) and Google search popularity, producing a comparative ranking system. The analysis includes five categories: endorsement money, Twitter followers, Instagram followers, Facebook followers and Google Trends score. For special situations (esports and China) we used two additional categories: other social media -- for when the athlete was more relevant on a platform outside the Big Three (Twitch, for example, although no gamers made the top 100) -- and, in China's case, Baidu search score, because Google is blocked there. 
 
 Salary is not used as a factor because of differences among sports. For example, players in a league with a salary cap would be at an unfair disadvantage when measured against players in uncapped leagues. Endorsement dollars, however, reflect the ability to draw attention -- which is a good way to define fame. 
 
 Endorsement amounts cover 2016 and were compiled by ESPN researchers. All currency figures were converted to U.S. dollars using March 27 rates. The social media followings and Google Trend scores (which show relative popularity based on how often names are searched on a scale of 0 to 100) were as of April 19. (Note: Where categories in the profiles are marked as NA, the athlete either doesn't have an official account for that social media site or an accurate endorsement figure could not be confirmed.) 
 
 Retired athletes are not included. Therefore, popular stars such as Tony Romo (No. 70 in 2016) and Floyd Mayweather (No. 26 in 2016) are absent. We have also excluded amateur athletes -- Deshaun Watson, Lonzo Ball and Katie Ledecky, for example -- due to lack of salary and endorsements. 
 
 Contributors: Primary research by Sachin Dave Chandan and Charlotte Gibson. Additional research by Sam Bruce, Jayaditya Gupta, Sam Lyon, Richard Maguire, James Martin, Gueorgui Milkov, Fernando Olivieri, Darren Rovell, Sripath Srinath, Xin Wan, Qixin Wang, Andy Withers and Ricardo Zanei.
– Tom Brady who? The all-star NFL quarterback might be a household name in the US, but he doesn't even make the top 20 of ESPN's list of the most famous athletes in the world, reports the Boston Herald. The 10 most well-known athletes, based on social media followers, endorsement money, and internet search popularity: Cristiano Ronaldo LeBron James Lionel Messi Roger Federer Phil Mickelson Neymar Usain Bolt Kevin Durant Rafael Nadal Tiger Woods Click to see the highest-ranking female athlete or the best US cities for football fans.