The Unknown

Serena Williams, is a sports legend no matter which way you look at it. Her titles are numerous, her feats record-breaking and, according to Forbes, the world's most marketable female athlete who, on several occasions, has been the only woman on their list of one hundred highest paid athletes. But there's certainly a lot more that makes Serena who she is that's been left as The Unknown.

Cristiano Ronaldo, has become synonymous with the sport which made him famous over a career which has, so far, only spanned less than two decades. While fans crave him, skyrocketing his social media presence and earnings beyond numbers ever seen before, his difficult temperament has made him significantly less friendships on the field.

Colin Kaepernick has made fans and enemies around the world from on simple action - kneeling. This adopted record-setter whose fight against racial injustice put him at odds with the President of the United States has created a nation-wide protest movement that seemingly ostracized him from the sport he loves.

Sports stars before they were known.

Sports stars before they were known.

Conor McGregor is one of the Ultimate Fighting Championship's greatest fighters whose records could impress even the most skeptical of his critics. Fighting since his youth, Conor rose through the ranks quickly before abruptly leaving the sport and making his many fans hungry for more. Aggressive in and out of the octagon, Conor's motto could very well be "take no prisoners".