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Does Guerrero know May is 'Money' month?

It's one of the best months on the sports calendar: May is home to several iconic sporting events, including the Kentucky Derby (on Saturday), the start of the French Open and the Indianapolis 500 (both on May 26).

The month also marks the return of boxing's best pound-for-pound fighter, Floyd Mayweather Jr. (43-0, 26 KOs). The five-division champ will put his welterweight title on the line against Roberto Guerrero (31-1-1, 2 NC, 18 KO) on Saturday in Las Vegas. Mayweather's career has become synonymous with the fifth month on the calendar. Seven of his career wins have come in May -- more victories than he has in any other month.

Most Wins by Month -- Mayweather

Among Mayweather's seven May victories are a split decision over Oscar De La Hoya and his most recent win, a unanimous decision against Miguel Cotto. Those fights are the two highest-grossing non-heavyweight bouts in pay-per-view history. Mayweather-De La Hoya, in particular, generated 2.46 million buys and $137 million in pay-per-view revenue. Both are all-time records in any weight class.

That's good news for Showtime, which inked Mayweather to a six-fight, 30-month deal in February. Saturday's fight will mark Mayweather's debut on the network.

Mayweather's opponent, Robert Guerrero -- a former titleholder at 126 and 130 pounds -- has never lost in May (2-0, both knockouts).