Phelps gears up for U.S. Nationals

Michael Phelps adjusts his headphones before competing in heat 14 of the Men's 100m Butterfly event at the U.S. National Swimming Championships in Irvine, California August 5, 2010.

Michael Phelps looks around before competing in the heats of the Men's 100m Butterfly event at the U.S. National Swimming Championships in Irvine, California August 5, 2010.

Swimmer Michael Phelps dives off the start blocks while on his way to winning the men's 200m freestyle event at the U.S. National Swimming Championships in Irvine, California, August 4, 2010.

Swimmer Michael Phelps dives off the start blocks while on his way to winning the men's 200m freestyle event at the U.S. National Swimming Championships in Irvine, California, August 4, 2010.

Ryan Lochte (R) and Michael Phelps look at the timing board after heat 17 of the men's 200 meters freestyle event at the U.S. National Swimming Championships in Irvine, California August 4, 2010. Lochte won the heat ahead of 14-times Olympic champion Phelps.

Michael Phelps competes in heat 17 of the men's 200 meters freestyle event at the U.S. National Swimming Championships in Irvine, California August 4, 2010. The 14-times Olympic champion finished second in the heat.

Michael Phelps competes during heat 11 of the men's 200 meters butterfly event at the U.S. National Swimming Championships in Irvine, California August 4, 2010. The 14-times Olympic champion finished first among all the heats at 1:57.54.

Michael Phelps competes during heat 11 of the men's 200 meters butterfly event at the U.S. National Swimming Championships in Irvine, California August 4, 2010. The 14-times Olympic champion finished first among all the heats at 1:57.54.
(Reuters)