Swimmer Michael Phelps (23 images)

American swimmer Michael Phelps practices at the National Aquatic Center, also know as the Water Cube, in preparation for the 2008 Summer Olympics in Beijing, China, on August 5, 2008. Phelps is in the running for a record eight gold medals. Opening Ceremonies will be held on August 8. (UPI Photo/Roger L. Wollenberg)

USA's Michael Phelps qualifies in first in the Men's 200M Individual Medley at the National Aquatic Center (Water Cube) during the 2008 Summer Olympics in Beijing, China, on August 13, 2008. (UPI Photo/Roger L. Wollenberg)

USA's Michael Phelps smiles after winning gold in the Men's 400 Meter Individual Medley final at the National Aquatic Center (Water Cube) during the 2008 Summer Olympics in Beijing, China, on August 10, 2008. (UPI Photo/Roger L. Wollenberg)

USA's Michael Phelps (R), Ryan Lochte (C) and Ricky Berens celebrate after their team took gold with a world record in the Men's 4x200M Relay at the National Aquatic Center (Water Cube) during the 2008 Summer Olympics in Beijing, China, on August 13, 2008. The effort earned Phelps his fifth gold medal. (UPI Photo/Roger L. Wollenberg)