Floyd Mayweather Jr. keeps raking it in.

For the third time in the past four years, the undefeated boxing champion has been named the World's Highest-Paid Athlete on Forbes' annual list. Here's a breakdown of the dizzying numbers for sports' reigning cash cow.

Mayweather earned $300 million within the last 12 months.

An estimated $200 million of that derived from his unanimous-decision win over Manny Pacquiao last month.

Mayweather received a $100 million paycheck for the actual fight, reportedly earning the additional $100 million in cuts from pay-per-view sales and the MGM Grand Garden Arena's live gate in Las Vegas.

Famously bragging that he became Forbes' cash king in previous years without receiving endorsements, Mayweather changed his tune by signing endorsement deals with Hublot, FanDuel and Burger King for a combined $15 million leading up to the May 2 mega bout. If fans will remember, Mayweather donned shorts by Hublot, the luxury watchmaker, during the bout with the Burger King character helping to lead him out to the ring. Cha-ching!

A previous $85 million was earned from his 2014 bout with Marcos Maidana, in addition to percentages from those pay-per-view buys and live gate attendance as well.

Mayweather's $300 million in total earnings the past year is nearly double of Manny Pacquiao's total earnings of $160 million for second on Forbes' 2015 World's Highest-Paid Athletes list.

In all, Mayweather has deposited a career total $420 million in boxing fight paychecks alone.

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