Roger Federer is going home with a gold medal. The Williams sisters could, too.
Federer and Stanislas Wawrinka took the men's doubles title, while Venus and Serena Williams clinched at least a silver medal in doubles.
The Williamses beating Ukraine's Alona and Kateryna Bondarenko to advance to the gold-medal match against Spain's Anabel Medina Garrigues and Virginia Ruano Pascual. The Williams sisters improved to 9-0 lifetime in Olympic doubles. They won the gold medal at Sydney in 2000 but didn't play doubles in 2004 because Serena was hurt.
Federer and Wawrinka beat Sweden's Simon Aspelin and Thomas Johansson 6-3, 6-4, 6-7 (4), 6-3. Federer closed it out with a service winner, threw up his arms and began hopping, then hugged his partner. This should help salve him finally losing his No. 1 status to Rafael Nadal on Monday.
Russia will win women's singles with countrymates Dinara Safina and Elena Dementieva squaring off. Dementieva beat another Russian, Vera Zvonareva, and Safina knocked out China's Li Na.
American twins Bob and Mike Bryan, who have won all four Grand Slam championships, won the bronze in men's doubles.
Novak Djokovic beat American James Blake for bronze in men's singles.
TRACK AND FIELD: Romania's Constantina Tomescu-Dita soared into the Bird's Nest, turning the Olympic marathon into a one-woman race.
Tomescu-Dita pulled away from the lead pack near the halfway mark Sunday to win by 22 seconds over her nearest challenger.
Reigning world champion Catherine Ndereba of Kenya outsprinted China's Zhou Chunxiu for the silver to the disappointment of the roaring crowd at National Stadium. Still, the bronze was China's first medal in track and field.
Valerie Vili, the reigning world outdoor and indoor champion, won the women's shot put, giving New Zealand its first gold medal in track and field since 1976.
Nataliia Dobrynska won the gold medal in women's heptathlon, leading a gold-silver finish for Ukraine. American Hyleas Fountain got the bronze.
SOFTBALL: The American juggernaut crushed another opponent, with Jessica Mendoza hitting her third home run in two days and Jennie Finch pitching five shutout innings for a 7-0 victory over Taiwan. They've outscored their foes 36-1, have allowed just four hits in 29 innings, and have now won 19 straight Olympic games.
"USA is too strong to defeat," Taiwan coach Chang Chia-Hsing said.
In other games, Japan beat China 3-0, Australia beat the Netherlands 8-0 and Venezuela, playing in its first Olympics, stunned Canada 2-0.
BOXING: Americans Shawn Estrada and Luis Yanez lost, leaving only two U.S. fighters in the tournament.
Yanez tied his match against Mongolia's Serdamba Purevdorj after three rounds, but couldn't pull it out.
Estrada lost to James Degale, the hard-punching Brit known as "Chunky."
Russian Matvey Korobov lost his first fight in five years, going down in a middleweight bout against Bakhtiyar Artayev of Kazakhstan, the welterweight winner in Athens.
WEIGHTLIFTING: American Cheryl Haworth was sixth in the women's super heavyweight division. Jang Mi-ran of South Korea broke three world records on the way to gold and the unofficial title of the world's strongest woman.
"I am a big girl but that's a lot of weight," said Haworth, who won a bronze medal in Sydney 2000.
MEN'S SOCCER: The semifinals are set: Nigeria vs. Belgium and Brazil vs. Argentina. Belgium beat Italy 3-2 and Nigeria beat Ivory Coast 2-0. Brazil beat Cameroon 2-0 and Argentina beat the Netherlands 2-1.
WOMEN'S FIELD HOCKEY: The U.S. women got their first win of the tournament, beating winless New Zealand 4-1. With one game left, the Americans still have a chance of making the semifinal round.