ATHENS, Greece -- A sloppy handoff in the men's 400-meter relay forced the United States to settle for silver, one hundredth of a second behind Britain.
U.S. anchor Maurice Greene took the baton in second place and with a burst of speed in the final 30 meters, made up some of the gap behind Britain's Mark Lewis-Francis -- but just failed to catch him. The British won in 38.07 seconds, and the Americans won silver in 38.08. Nigeria took the bronze.
The U.S. relay was undermined by a poor handoff from its second runner, 100-meter gold medalist Justin Gatlin, to Coby Miller.
The United States swept the 1,600-meter relays.
The men's team -- Otis Harris, Derrick Brew, Jeremy Wariner and Darold Williamson -- handily won gold in 2 minutes, 55.91 seconds.
The women's 1,600 relay team of DeeDee Trotter, Monique Henderson, Sanya Richards and Monique Hennagan won in 3:19.01.
Thailand's Manus Boonjumnong pulled the biggest upset of Saturday's five gold medal bouts, beating Yudel Johnson of Cuba 17-11 in a light welterweight bout.
The gold medal bouts for the final six weight classes will be contested today. Among them is the light heavyweight final, where American Andre Ward faces Magomed Aripgadjiev of Belarus.
Argentina won its first Olympic gold medal in soccer, beating Paraguay 1-0.
American Cael Sanderson won the gold medal in men's 185-pound freestyle, beating Moon Eui-jae of South Korea, 3-1. While at Iowa State, Sanderson became the only four-time unbeaten champion in NCAA history.
American Steven Lopez won his second Olympic gold medal by defeating Bahri Tanrikulu of Turkey 3-0 in the under 80-kilogram final. Lopez won gold in Sydney in 2000 at 68 kilograms.
-- From wire reports