Greene passed Puerto Rico’s Javier Culson in the final 20 meters to win the men’s final in 48.26 seconds, while Demus took the women’s title in 52.47 seconds, the leading time in the world this year.
“I still had not had a gold medal, so this is great,” Demus told reporters. “It feels so great to bring it home.”
Jesse Williams of the U.S. won the men’s high jump, Ukraine’s Olha Saladuha took the women’s triple jump, Kenya’s Ezekiel Kemboi won the men’s 3,000-meter steeplechase and American Jennifer Barringer Simpson captured the women’s 1,500 meters.
Double-amputee sprinter Oscar Pistorius helped South Africa reach the final of tomorrow’s men’s 1,600-meter relay. Pistorius, who runs with J-shaped carbon-fiber blades, led off as South Africa finished third in its heat behind the U.S. and Jamaica in a national-record time of 2 minutes, 59.21 seconds.
Pistorius, who finished last in his individual 400-meter semifinal three days ago, was born without fibulas and had both legs amputated below the knee when he was 11 months old.
Defending champion Caster Semenya of South Africa finished second in her heat to qualify for the semifinals of the women’s 800 meters.
Semenya was banned from competing for 11 months because of questions about her sex after she took the world title in Berlin two years ago. She was cleared to compete in July 2010.
In addition to the men’s 1,600 relay, finals will be held tomorrow in the men’s shot put and long jump and the women’s javelin, 5,000 meters and 200 meters. The heats and semifinals of the men’s 200, featuring world-record holder Usain Bolt of Jamaica, will also be run.