Manny Pacquiao of Philippines warms up before training at a gym in Las Vegas, Nevada June 25, 2008. Pacquiao will challenge WBC lightweight champion David Diaz of the U.S. for the WBC lightweight title at the Mandalay Bay Events Center on June 28. REUTERS/Steve Marcus/Las Vegas Sun (UNITED STATES)
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Trainer Freddie Roach watches Manny Pacquiao of Philippines train at a gym in Las Vegas, Nevada June 25, 2008. Pacquiao challenges WBC lightweight champion David Diaz of the U.S. for the WBC title at the Mandalay Bay Events Center June 28. REUTERS/Steve Marcus/Las Vegas Sun (UNITED STATES)
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Manny Pacquiao of Philippines works on his abdominal muscles as strength and conditioning coach Alex Ariza looks on during a workout in Las Vegas, Nevada June 25, 2008. Pacquiao will challenge WBC lightweight champion David Diaz of the U.S. for the WBC lightweight title at the Mandalay Bay Events Center on June 28. REUTERS/Steve Marcus/Las Vegas Sun (UNITED STATES)
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Manny Pacquiao of Philippines jumps rope at a gym in Las Vegas, Nevada June 25, 2008. Pacquiao will challenge WBC lightweight champion David Diaz of the U.S. for the WBC lightweight title at the Mandalay Bay Events Center on June 28. Strength and conditioning coach Alex Ariza looks on. REUTERS/Steve Marcus/Las Vegas Sun (UNITED STATES)
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Manny Pacquiao of Philippines hits a speedbag at a gym in Las Vegas, Nevada June 25, 2008. Pacquiao will challenge WBC lightweight champion David Diaz of the U.S. for the WBC lightweight title at the Mandalay Bay Events Center on June 28. Filipino trainer Boboy Fernandez watches at right. REUTERS/Steve Marcus/Las Vegas Sun (UNITED STATES)
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Manny Pacquiao of Philippines hits a speedbag at a gym in Las Vegas, Nevada June 25, 2008. Pacquiao will challenge WBC lightweight champion David Diaz of the U.S. for the WBC lightweight title at the Mandalay Bay Events Center on June 28. REUTERS/Steve Marcus/Las Vegas Sun (UNITED STATES)
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Manny Pacquiao of Philippines hits pads held by trainer Freddie Roach at a gym in Las Vegas, Nevada June 25, 2008. Pacquiao will challenge WBC lightweight champion David Diaz of the U.S. for the WBC lightweight title at the Mandalay Bay Events Center on June 28. REUTERS/Steve Marcus/Las Vegas Sun (UNITED STATES)
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Manny Pacquiao (R) of Philippines works out with trainer Freddie Roach at a gym in Las Vegas, Nevada June 25, 2008. Pacquiao will challenge WBC lightweight champion David Diaz of the U.S. for the WBC lightweight title at the Mandalay Bay Events Center on June 28. REUTERS/Steve Marcus/Las Vegas Sun (UNITED STATES)
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Manny Pacquiao (R) of Philippines works on his timing with trainer Freddie Roach at a gym in Las Vegas, Nevada June 25, 2008. Pacquiao will challenge WBC lightweight champion David Diaz of the U.S. for the WBC lightweight title at the Mandalay Bay Events Center on June 28. REUTERS/Steve Marcus/Las Vegas Sun (UNITED STATES)
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Manny Pacquiao of Philippines shadow boxes during training at a gym in Las Vegas, Nevada June 25, 2008. Pacquiao will challenge WBC lightweight champion David Diaz of the U.S. for the WBC lightweight title at the Mandalay Bay Events Center on June 28. REUTERS/Steve Marcus/Las Vegas Sun (UNITED STATES)
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