The U.S. men's basketball team took a small first step on the march to Beijing yesterday in Las Vegas: The Americans tried on their new uniforms, then went through a two-hour, one-day practice at Cox Pavilion on the UNLV campus.

"We just wanted to start putting our offense in and run shots and the speed at which we're trying to play, and let them interact," coach Mike Krzyzewski said.

This was the first gathering of the 12-member squad since it was announced Monday. Four players - LeBron James, Carmelo Anthony, Dwyane Wade and Carlos Boozer - are holdovers from the 2004 Olympic team, which took home the bronze medal.

The team will play an exhibition game against Canada on July 25 at UNLV's Thomas & Mack Center before leaving for China, where it will play four more exhibitions before arriving in Beijing. The United States opens preliminary round play against host China on Aug. 10.

Jamaican track trials.

World-record holder Usain Bolt beat Asafa Powell, the sprinter whose record he broke, in the 100-meter final in Jamaica's Olympic trials in Kingston.

Bolt finished first in 9.85 seconds, with Powell second in 9.97. Last month in New York, Bolt ran a 9.72 to break Powell's world record of 9.74. (Powell did not take part in that race.)

Chambers' time

. British sprinter Dwain Chambers twice ran within the "A" qualifying time in Biberach, Germany, for the Beijing Games, a result he hopes will strengthen his case for appealing his doping ban.

Chambers finished in 10.06 seconds to win the 100 meters at the Weltklasse meet. He had run 10.14 in his heat, beating the qualifying time of 10.21 required to run in the Olympics for the first time since returning from a two-year suspension this year.

Chambers remains barred from Beijing because of a lifetime Olympic ban under guidelines set down by the British Olympic Association.