U.S. Olympic swim trials

Athletes compete for a place on the U.S. swimming team at the 2012 Olympic games in London.

Dara Torres, left, looks at the results after swimming in the women's 50-meter freestyle final at the U.S. Olympic swimming trials as Kara Lynn Joyce and Jessica Hardy, right, celebrate, Monday, July 2, 2012, in Omaha, Neb. (AP Photo/Nati Harnik)

Michael Phelps 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)

Michael Phelps swims to victory in the men's 100-meter butterfly final at the U.S. Olympic swimming trials on Sunday, July 1, 2012, in Omaha, Neb. (AP Photo/Mark Humphrey)

Anthony Ervin dives off of the starting block at the start of the championship final of the Men's 50 m Freestyle during Day Seven of the 2012 U.S. Olympic Swimming Team Trials at CenturyLink Center on July 1, 2012 in Omaha, Nebraska. (Photo by Al Bello/Getty Images)

Dara Torres celebrates after she competed in the second semi final heat of the Women's 50 m Freestyle during Day Seven of the 2012 U.S. Olympic Swimming Team Trials at CenturyLink Center on July 1, 2012 in Omaha, Nebraska. (Photo by Al Bello/Getty Images)

Ryan Lochte leaves his lane after swimming in a men's 200-meter individual medley semifinal at the U.S. Olympic swimming trials on Friday, June 29, 2012, in Omaha, Neb. At left is Michael Phelps. (AP Photo/Mark Humphrey)

Elizabeth Pelton competes in preliminary heat 18 of the Women'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)

Michael Phelps (C) dives of off the starting block as he competes in preliminary heat 13 of the Men's 100 m Butterfly 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)

Janet Evans swims in the women's 800-meter freestyle preliminaries at the U.S. Olympic swimming trials, Saturday, June 30, 2012, in Omaha, Neb. (AP Photo/Mark Humphrey)

Scott Weltz celebrates after winning the men's 200-meter breaststroke final at the U.S. Olympic swimming trials on Friday, June 29, 2012, in Omaha, Neb. (AP Photo/Mark Humphrey)

Nathan Adrian pumps his fist after winning the men's 100-meter freestyle final at the U.S. Olympic swimming trials, Friday, June 29, 2012, in Omaha, Neb. (AP Photo/Mark J. Terrill)

Scott Weltz swims to victory in the men's 200-meter breaststroke final at the U.S. Olympic swimming trials on Friday, June 29, 2012, in Omaha, Neb. (AP Photo/Mark Humphrey)

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)

Michael Phelps swims in the men's 200-meter butterfly semifinal at the U.S. Olympic swimming trials, Wednesday, June 27, 2012, in Omaha, Neb. (AP Photo/Mark Humphrey)

David Walters, from left, Jason Lezak and Ryan Lochte dive at the start of a men's 100-meter freestyle semifinal at the U.S. Olympic swimming trials, Thursday, June 28, 2012, in Omaha, Neb. (AP Photo/Nati Harnik)

Eric Shanteau swims in the men's 200-meter breaststroke preliminaries at the U.S. Olympic swimming trials, Thursday, June 28, 2012, in Omaha, Neb. (AP Photo/Mark J. Terrill)

swim

Ryan Lochte, left, and Michael Phelps look at the time after finishing in the men's 400-meter individual medley final at the U.S. Olympic swimming trials, Monday, June 25, 2012, in Omaha, Neb. (AP Photo/David Phillip)

swim

Ryan Lochte swims in the men's 400-meter individual medley final at the U.S. Olympic swimming trials, Monday, June 25, 2012, in Omaha, Neb. (AP Photo/Mark Humphrey)