Ryan Lochte was the top American swimmer who presented the best challenge to Michael Phelps at the 2012 Summer Olympics in London.
Silver medalist Ryan Lochte of the United States
Silver medalist Ryan Lochte of the United States poses during the medal ceremony for the men's 200-meter individual medley on Day 6 of the London 2012 Olympic Games at the Aquatics Centre in London. (Aug. 2, 2012) (Credit: Getty Images)
Silver medalist Ryan Lochte of the United States
Silver medalist Ryan Lochte of the United States stands on the podium during the medal ceremony for the men's 200-meter individual medley final of the London 2012 Olympic Games at the Aquatics Centre in London. (Aug. 2, 2012) (Credit: Getty Images)
Michael Phelps dives into the pool next to
Michael Phelps dives into the pool next to fellow U.S. swim team member Ryan Lochte and Japan's Kosuke Hagino at the start of the men's 200-meter individual medley final at the London 2012 Olympic Games. Phelps won his 20th career Olympic medal and completed a historic third consecutive 200-IM Olympic victory. (Aug. 2, 2012) (Credit: Getty Images)

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Ryan Lochte of the United States gathers his
Ryan Lochte of the United States gathers his thoughts before competing on Day 6 of the London 2012 Olympic Games at the Aquatics Centre in London. (Aug. 2, 2012) (Credit: Getty Images)
Silver medalist U.S. swimmer Ryan Lochte waves after
Silver medalist U.S. swimmer Ryan Lochte waves after the podium ceremony for the men's 200-meter individual medley swimming event at the London 2012 Olympic Games. (Aug. 2, 2012) (Credit: Getty Images)
Ryan Lochte of the United States waits before
Ryan Lochte of the United States waits before competing on Day 6 of the London 2012 Olympic Games at the Aquatics Centre in London. (Aug. 2, 2012) (Credit: Getty Images)
Bronze medalist Ryan Lochte of the United States
Bronze medalist Ryan Lochte of the United States stands on the podium during the medal ceremony for the men's 200-meter backstroke competition at the London 2012 Olympic Games in the Aquatics Centre in London. (Aug. 2, 2012) (Credit: Getty Images)
Gold medalist Michael Phelps of the United States
Gold medalist Michael Phelps of the United States points while waiting to receive his medal as he stands next to silver medalist Ryan Lochte of the United States during the awards ceremony for the men's 200-meter individual medley competition in the London 2012 Olympic Games' Aquatics Centre. (Aug. 2, 2012) (Credit: Getty Images)

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United States' Ryan Lochte poses with his gold
United States' Ryan Lochte poses with his gold medal for the men's 400-meter individual medley swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. (July 28, 2012) (Credit: AP)
United States' Ryan Lochte competes in a men's
United States' Ryan Lochte competes in a men's 200-meter backstroke at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. (Aug. 1, 2012) (Credit: AP)
U.S.'s Ryan Lochte reacts after finishing first in
U.S.'s Ryan Lochte reacts after finishing first in the men's 400-meter individual medley swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. (July 28, 2012) (Credit: AP )
United States' Ryan Lochte is congratulated by Japan's
United States' Ryan Lochte is congratulated by Japan's Yuya Horihata after finishing first in the men's 400-meter individual medley swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. (July 28, 2012) (Credit: AP)
United States' Ryan Lochte competes in the men's
United States' Ryan Lochte competes in the men's 400-meter individual medley swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London. (July 28, 2012) (Credit: AP)

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U.S. swimmer Ryan Lochte competes in the men's
U.S. swimmer Ryan Lochte competes in the men's 400m individual medley heats swimming event at the London 2012 Olympic Games in London. (July 28, 2012) (Credit: Getty Images)
Swimmer Ryan Lochte--who may out-Phelps Olympic champ Michael
Swimmer Ryan Lochte--who may out-Phelps Olympic champ Michael Phelps at this month's Olympics--stands with a Polo Ralph Lauren beach towel, $60, and Team USA polo, $145; at select Ralph Lauren stores and ralphlauren.com. (July 2012) (Credit: Handout)
Ryan Lochte swims in a men's 200-meter backstroke
Ryan Lochte swims in a men's 200-meter backstroke semifinal at the U.S. Olympic swimming trials in Omaha, Neb. (June 29, 2012) (Credit: AP)
OMAHA, NE - JUNE 30: Ryan Lochte competes
OMAHA, NE - JUNE 30: Ryan Lochte competes in the first semifinal heat of the Men's 100 m Butterfly during Day Six of the 2012 U.S. Olympic Swimming Team Trials at CenturyLink Center in Omaha, Neb. (June 30, 2012) (Credit: Getty)
Ryan Lochte, left and Michael Phelps embrace after
Ryan Lochte, left and Michael Phelps embrace after swimming in the men's 400-meter individual medley final at the U.S. Olympic swimming trials, Monday, June 25, 2012, in Omaha, Neb. Lochte won the race. (AP Photo/The Omaha World-Herald/Matt Miller) MAGS OUT TV OUT (Credit: AP Photo MATT MILLER)
Ryan Lochte makes his way out of the
Ryan Lochte makes his way out of the pool after his first place finish in the men's 200M Backstroke semifinal Heat 2 on day five of the 2012 US Olympic Team Trials on June 29, 2012 in Omaha, Nebraska. AFP PHOTO/Frederic J. BROWNFREDERIC J. BROWN/AFP/GettyImages (Credit: Getty FREDERIC J. BROWN)
Ryan Lochte gives a thumbs up after swimming
Ryan Lochte gives a thumbs up after swimming in the men's 200-meter freestyle preliminaries at the U.S. Olympic swimming trials, Tuesday, June 26, 2012, in Omaha, Neb. (AP Photo/Mark J. Terrill) (Credit: AP Photo Mark J. Terrill)
OMAHA, NE - JUNE 30: Ryan Lochte looks
OMAHA, NE - JUNE 30: Ryan Lochte looks on during the medal ceremony for the Men's 200 m Backstroke during Day Six of the 2012 U.S. Olympic Swimming Team Trials at CenturyLink Center on June 30, 2012 in Omaha, Nebraska. (Photo by Jamie Squire/Getty Images) (Credit: Getty Jamie Squire)
OMAHA, NE - JUNE 30: Ryan Lochte looks
OMAHA, NE - JUNE 30: Ryan Lochte looks on prior to swimming in the championship final of the Men's 200 m Backstroke during Day Six of the 2012 U.S. Olympic Swimming Team Trials at CenturyLink Center on June 30, 2012 in Omaha, Nebraska. (Photo by Al Bello/Getty Images) (Credit: Getty Al Bello)
OMAHA, NE - JUNE 30: Ryan Lochte looks
OMAHA, NE - JUNE 30: Ryan Lochte looks on after he competed in the first semifinal heat of the Men's 100 m Butterflyduring Day Six of the 2012 U.S. Olympic Swimming Team Trials at CenturyLink Center on June 30, 2012 in Omaha, Nebraska. (Photo by Al Bello/Getty Images) (Credit: Getty Al Bello)
Ryan Lochte swims in a men's 200-meter backstroke
Ryan Lochte swims in a men's 200-meter backstroke semifinal at the U.S. Olympic swimming trials on Friday, June 29, 2012, in Omaha, Neb. (AP Photo/Mark Humphrey) (Credit: AP Photo Mark Humphrey)
OMAHA, NE - JULY 01: Ryan Lochte competes
OMAHA, NE - JULY 01: Ryan Lochte competes in the championship final of the Men's 100 m Butterfly during Day Six of the 2012 U.S. Olympic Swimming Team Trials at CenturyLink Center on July 1, 2012 in Omaha, Nebraska. (Photo by Jamie Squire/Getty Images) (Credit: Getty Jamie Squire)
U.S. Olympic swim team member Ryan Lochte enjoys
U.S. Olympic swim team member Ryan Lochte enjoys a laugh with teammates before practice at the University of Tennessee's Allan Jones Aquatic Center, Thursday, July, 12, 2012, in Knoxville, Tenn. (AP Photo/Knoxville News Sentinel, Michael Patrick) (Credit: AP Photo Michael Patrick)
FILE - This product image released by Ralph
FILE - This product image released by Ralph Lauren shows U.S. Olympic swimmer Ryan Lochte modeling the the official Team USA Opening Ceremony Parade Uniform. Republicans and Democrats railed Thursday, July 12, 2012, about the U.S. Olympic Committee's decision to dress the U.S. team in Chinese manufactured berets, blazers and pants while the American textile industry struggles economically with many U.S. workers desperate for jobs. (AP Photo/Ralph Lauren, File) (Credit: AP Photo)
U.S. Olympic swim team member Ryan Lochte greets
U.S. Olympic swim team member Ryan Lochte greets fans during an autograph session after practice at the University of Tennessee's Allan Jones Aquatic Center, Thursday, July, 12, 2012, in Knoxville, Tenn. (AP Photo/Knoxville News Sentinel, Michael Patrick) (Credit: AP Photo Michael Patrick)
Ryan Lochte competes in preliminary heat 13 of
Ryan Lochte competes in preliminary heat 13 of the Men's 200 m Individual Medley during Day Five of the 2012 U.S. Olympic Swimming Team Trials at CenturyLink Center. (June 29, 2012) (Credit: Getty Images)
Ryan Lochte starts in the men's 200-meter freestyle
Ryan Lochte starts in the men's 200-meter freestyle preliminaries at the U.S. Olympic swimming trials. (June 26, 2012) (Credit: AP)
Ryan Lochte looks at time time after swimming
Ryan Lochte looks at time time after swimming in the men's 400-meter individual medley preliminaries at the U.S. Olympic swimming trials. (June 25, 2012) (Credit: AP)
FILE - This Aug. 4, 2010, file photo
FILE - This Aug. 4, 2010, file photo shows Michael Phelps, right, and Ryan Lochte looking toward the results after the men's 200-meter freestyle at the U.S. championships swim meet, in Irvine, Calif. (Credit: AP)