The 25 most popular athletes of 2017

9:33am PST - December 23rd, 2017    maria sharapova - Business Insider

ESPN released its ranking of the most popular athletes in the world back in May, and once again, Cristiano Ronaldo was at the top of the list. The list was compiled by Ben Alamar, ESPN's director of analytics. He devised a formula that weighs factors like end…