Michael Phelps

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Olympic swimmer Michael Phelps, second from right, joins other Olympic athletes from Maryland, including swimmer Katie Ledecky, left, windsurfer Farrah Hall, second from left, and modern pentathlete Suzanne Stettinius, third from right, and Baltimore County Executive Kevin Kamenetz, right, during a celebration of the achievements of Maryland Olympians, Monday, Sept. 10, 2012, in Baltimore. Phelps ended his Olympic career in London with six medals and a record tally of 22 career medals. (AP Photo/Steve Ruark)

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United States' Michael Phelps, right, and United States' Ryan Lochte pose with their medals for the men's 200-meter individual medley swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Thursday, Aug. 2, 2012. Phelps won gold and Lochte silver. (AP Photo/Michael Sohn)

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United States' Michael Phelps gets out of the water after swimming butterfly in the men's 4 X 100-meter medley relay at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics, London, Saturday, Aug. 4, 2012. (AP Photo/Jae C. Hong)

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associated press Michael Phelps needs to work on ignoring that 6 a.m. wake-up habit he followed for years in training.

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United States' swimmer Michael Phelps smiles as he wars his 1th gold medal at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Saturday, Aug. 4, 2012. Phelps pushed the United States in front to win the medley relay Saturday in the final swimming event of the London Games, after which he is retiring.(AP Photo/Mark J. Terrill)

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United States' men's 4 X 100-meter medley relay team from left, Matthew Grevers, Brendan Hansen, Michael Phelps and Nathan Adrian hold their gold medals at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Saturday, Aug. 4, 2012. (AP Photo/Jae C. Hong)

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United States' swimmer Michael Phelps poses with his gold medal in the men's 4 x 100-meter medley relay at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Saturday, Aug. 4, 2012. (AP Photo/Michael Sohn)

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** FILE ** United States' Michael Phelps swims in the men's 4 X 100-meter medley relay at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Saturday, Aug. 4, 2012. (AP Photo/Julio Cortez)

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United States' Michael Phelps swims in the men's 100-meter butterfly swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Friday, Aug. 3, 2012. (AP Photo/Julio Cortez)

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United States' Michael Phelps displays his gold medal for the men's 100-meter butterfly swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Friday, Aug. 3, 2012. (AP Photo/Matt Slocum)

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United States' Michael Phelps competes in a men's 100-meter butterfly swimming semifinal at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Thursday, Aug. 2, 2012. (AP Photo/Michael Sohn)