Tennis rivals Roger Federer of Switzerland and Novak Djokovic of Serbia are aiming to become the first athletes in their sport to earn at least $100 million (AU $137.45 million) in their respective careers and they will most likely go past that mark during the 2016 ATP season.

Federer, who has career earnings of $97.3M (AU $133.7 million), excluding money earned from endorsements and sponsorships, will have a shot of breaking that 100M-mark at the 2016 Australian Open, if he wins his 18th Grand Slam title.

The first tennis major tournament of the year is expected to offer a champion’s prize money of around $2.8 million (AU $3.85 million) for the men’s singles winner, which would put Federer over the $100M-mark, as noted first by Yahoo Sports New Zealand.

Meanwhile, World No. 1 Djokovic has career earnings of $94.05 million (AU $129.29 million) so far in his career. The winner of last year’s edition of the Aussie Open, Djokovic is most likely to break the $100M-mark at around the first half of the ATP season, or even earlier, if he duplicate's his successful 2015 ATP season.

According to statsita.com, a website which records athletes’ earnings over the course of their career, Federer and Djokovic are the top two earners in the history of tennis. Rafael Nadal is a distant third at $75.89 million (AU $104.33 million) while retired legend Pete Sampras and current World No. 2 Andy Murray are in fourth and fifth places at $43.28M (AU $59.5M) and $42.44M (AU $58.34M), respectively.

Despite not winning a Grand Slam since 2012, Federer was named as the world’s most marketable sports star in 2015 beating the like of golf’s Tiger Woods and Phil Mickelson and the NBA’s LeBron James, among others.

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