Boxer Floyd Mayweather Jr. is once again the undisputed champion of the world's highest paid athletes.

"Forbes" magazine puts Mayweather and his 300-million-dollars in winnings and endorsements in 2015 at the top of its list.

Mayweather has topped the Forbes' list three times in the last four years.

The undefeated fighter earned 100-million dollars alone for his much-hyped match against Manny Pacquiao .

Pacquiao earned 160-million dollars to move to number two.

Soccer stars Cristiano Ronaldo and Lionel Messi and tennis star Roger Federer complete the top five.

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