Thanks to rain, Victoria Azarenka, Venus Williams and 20 other women at the Olympics who have yet to complete a singles match could end up on court six consecutive days if they reach the gold medal round.

Sunday showers at Wimbledon forced the postponement of 32 matches and the suspension of four others, meaning just one-quarter of the day's matches were completed. Rain delays often disrupt Wimbledon's two-week Grand Slam tournament, but the Olympic event at the All England Club is just nine days.

Lewis Hamilton delivered a flawless drive from pole position to the chequered flag to win Sunday's Hungarian Grand Prix for McLaren and revive his challenge for this year's Formula One drivers' world championship.

The 27-year-old Briton took control of the race from the start and stayed in front, pit stops apart, as he resisted strong late pressure to come home ahead of Finland's Lotus driver Kimi Raikkonen.

Urby Emanuelson scored in the 68th minute as AC Milan edged Champions League winner Chelsea 1-0 in an exhibition contest at Sun Life Stadium.

Emanuelson converted on a running attack with teammate Stephen El-Shaarawy in front of a crowd of 57,748.

American swimmer Ryan Lochte sunk record-chasing Michael Phelps Saturday in a pulsating start to the Olympics while China's Sun Yang and Ye Shiwen wrote their name in the record books.

Lochte's 400m individual medley showdown with Phelps turned out to be a no-contest as he dominated to win in 4min 05.18sec, ahead of Brazilian Thiago Pereira and Japan's Kosuke Hagino, with Phelps back in fourth.

Alade Aminu scored 15 points and grabbed nine rebounds while Ike Diogu added 13 points and 10 rebounds as Nigeria just beat Tunisia 60-56 in the opening game of the Olympic men's basketball tournament.

Al-Farouq Aminu, who played for the NBA New Orleans Hornets last season, added 10 points and nine rebounds for the Nigerians, who have not lost to reigning African champion Tunisia in international competition since 1987.

The organizers of the London Olympics faced a growing storm Sunday over blocks of empty seats at several venues, while British police were reportedly probing an alleged black-market scandal.

Local organizers LOCOG and the International Olympic Committee said they were urgently investigating why there were rows and rows of unoccupied seats at venues including Wimbledon for the tennis and the Aquatics Centre.

arah Menezes made history by becoming the first Brazilian woman to win an Olympic judo gold medal when she triumphed in the under-48kg category here on Saturday.

The second-seeded Menezes dethroned reigning champion Alina Dumitru of Romania in the final.

Freshly-crowned Olympic road race champion Alexandre Vinokourov of Kazakhstan said he was finally ready to retire from the sport.

"It's magnificent to end it like this," said Vinokourov, who beat Colombia's Rigoberto Uran to the gold medal after 249.5 km of racing.

The Olympic cauldron will be broken up at the London closing ceremony and each of its 204 copper 'petals' given to the competing nations as a souvenir, its creator said Saturday.

Thomas Heatherwick said he had wanted to create a cauldron for the Olympic flame that would "root the whole ceremony in the spectators, in the people who would be there".

China's world number one Yi Siling won the first gold of the London Olympics in the women's 10m air rifle competition at London's Royal Artillery Barracks on Saturday.

In a tense contest Poland's Sylwia Bogacka took silver while Yu Dan of China won bronze.