Marcos René Maidana

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Marcos Maidana, from Argentina, celebrates at the end of his WBC-WBA welterweight title boxing fight against Floyd Mayweather Jr., lower left, Saturday, May 3, 2014, in Las Vegas. Mayweather won the bout by majority decision. (AP Photo/Eric Jamison)

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Marcos Maidana, from Argentina, celebrates at the end of his WBC-WBA welterweight title boxing fight against Floyd Mayweather Jr., Saturday, May 3, 2014, in Las Vegas. Mayweather won the bout by majority decision. (AP Photo/Isaac Brekken)

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Floyd Mayweather Jr. celebrates his majority decision win over Marcos Maidana in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Eric Jamison)

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Floyd Mayweather Jr., left, trades blows with Marcos Maidana, from Argentina, in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)

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Marcos Maidana, left, from Argentina, drives Floyd Mayweather Jr. against the ropes in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Eric Jamison)

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Floyd Mayweather Jr., right, is tended to in his corner during his WBC-WBA welterweight title boxing fight against Marcos Maidana Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)

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Marcos Maidana, left, from Argentina, trades punches with Floyd Mayweather Jr. in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)

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Marcos Maidana, left, from Argentina, throws a left at the head of Floyd Mayweather Jr. in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)

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Marcos Maidana, left, from Argentina, trades blows with Floyd Mayweather Jr. in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)

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Floyd Mayweather Jr., right, trades punches with Marcos Maidana, from Argentina, in their WBC-WBA welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Eric Jamison)

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Floyd Mayweather Jr. sits in his corner during his WBC-WBA welterweight title boxing fight against Marcos Maidana Saturday, May 3, 2014, in Las Vegas. (AP Photo/Eric Jamison)

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Boxer Marcos Maidana attends a news conference Wednesday, April 30, 2014, in Las Vegas. Maidana will square off against Floyd Mayweather Jr. in a welterweight title fight on Saturday, May 3. (AP Photo/Isaac Brekken)