The tennis legend is now reportedly a billionaire and joins the likes of LeBron James and Lionel Messi, who have leveraged their success in their respective sport to the next level. According to Forbes, Federer's net worth boost is due to the "significant minority stake in publicly traded Swiss shoe and apparel brand On."

In fact, Federer became the second tennis player after Tiriac to join the club. Despite bidding adieu to the game three years before, Federer's net worth was boosted by his minority stake in Swiss shoe and apparel brand On.

Tennis icon Roger Federer has become the seventh billionaire athlete in history, according to estimates published by Forbes on Friday.