Serena and Sharapova through to semis

The Belgian will retire for the second time after the US Open later this month and will do so without an Olympic medal after her first and last Games was brought to an end.
Sharapova made a fast start and, although Clijsters delighted the Centre Court crowd by breaking back in the second set, she could not force a decider and lost out 6-2 7-5.
Clijsters was happy to exit centre stage, saying: 'It was great. It's a nice experience every time you go out on Centre Court so I'm happy to say that my last match at Wimbledon was on Centre Court.
'I think overall she was the better player. She served well and I think of all the matches that I've played against her this is the best that she's served, and on grass it's going to be tough to beat her.'
Sharapova was thrilled with the result, and she said: 'I certainly had to step up today from my previous round. Kim is so experienced, a grand slam champion.
'I knew that it would be really tough and I really wanted to win today so I stayed extra focused. It was obviously getting close and it was such a tight second set I was just happy to get through this one.'
Russia is now guaranteed at least a silver medal in the women's Singles because in the last four Sharapova will face countrywoman Maria Kirilenko.
The 14th seed earlier pulled off a very impressive 7-6 (7/3) 6-3 victory over sixth seed and former Wimbledon champion Petra Kvitova.
Serena Williams advanced with a 6-0 6-3 win over eighth seed Caroline Wozniacki.
The USA player is likely to have a tougher time tomorrow against Victoria Azarenka, whom she edged out in two tight sets on her way to a fifth Wimbledon title four weeks ago.
Azarenka was forced to dig deep by seventh seed and Wimbledon semi-finalist Angelique Kerber from Germany before coming through 6-4 7-5.
Williams is still on track for two gold medals after teaming up with sister Venus to defeat French Open champions Sara Errani and Roberta Vinci from Italy 6-1 6-1 in the quarter-finals of the women's Doubles.
Kirilenko is also still in both events and will be the next opponent for the Williams sisters along with partner Nadia Petrova, while the other semi-final will see USA top seeds Liezel Huber and Lisa Raymond meet Czechs Lucie Hradecka and Andrea Hlavackova.

Day 6 Review: Record-breaking night in the pool

Phelps led from start to finish in the 200m Individual Medley and held off fast-finishing USA team-mate Ryan Lochte down the final freestyle leg to win in 1:54.27, just 0.04 outside his own Olympic record.
It means Phelps is the first man to win the event at three consecutive Games, and it came just 48 hours after he won his 18th and 19th medals to become the most decorated Olympian in history, overtaking Russian gymnast Larisa Latynina, who won 18.
Lochte, who had been forced to settle for bronze in the 200m Backstroke final 30 minutes earlier, took silver in 1:54.90, with Hungary's Laszlo Cseh taking bronze.
Phelps, who will retire after the Games, said: 'To be able to win the gold medal and be the first to three-peat is something very special and something I am very happy about.'
Phelps could also win the 100m Butterfly title for the third time in succession after later returning to the pool to win his semi-final in 50.86 and advance to the final as fastest qualifier.
USA swimmers won three of the four finals on Day 6, with Soni getting the ball rolling in style, claiming gold in the 200m Breaststroke by smashing her own world record.
The 25-year-old took control of the race after the opening length and touched in a time of 2:19.59, slicing more than four tenths of a second off her previous time. Japan's Satomi Suzuki claimed silver, with Russian Iuliia Efimova taking bronze.
'I wasn't trying to focus on records or medals or anything, I just wanted to swim one more race the way I knew I could,' Soni said. 'It has been my goal since I was a little girl to swim under 2.20, my coach told me I could be the first woman to swim 2.19 and I have been chasing it ever since, and I am just so happy.'
Tyler Clary then took gold in the 200m Backstroke ahead of Japan's Ryosuke Irie and defending champion Lochte, clocking an Olympic record of 1:53.41 as Lochtefaded on the last length.
The Netherland's Ranomi Kromowidjojo ensured there would not be a clean sweep of the evening's four finals by USA swimmers, powering to victory in the 100m Freestyle and lowering her Olympic record - set yesterday - to 53.00.
The 21-year-old was only fourth at the turn but stormed down the final length to finish ahead of Aliaksandra Herasimenia and China's Yi Tang.

Day 6 Review: USA men keep on falling

Gausha came out on the wrong end of a 16-15 decision after an exciting fight with Indian Vijender, while earlier the 19-year-old Californian Ramirez was a 15-11 loser to Fazliddin Gaibnazarov of Uzbekistan.
The two losses leave the United States with just Errol Spence and Rau'shee Warren remaining from a start-list of nine men, as well as their three women fighters who begin their respective campaigns at the weekend.

Big-punching Gausha threw in a strong final round but could not sway the judges to swing the bout in his favour, while Ramirez said he had no complaints over the nature of his defeat to his Uzbek opponent.

Ramirez said: 'I came out trying to be patient but I guess being patient didn't work for me tonight. I have no complaints about the decision. It has been great to be here as part of the team and it has given me a lot of opportunities.'

Earlier, Vasyl Lomachenko showed the skills that have seen him routinely highlighted as the best amateur boxer in the world as he got his quest for a second Olympic title under way with victory over the Dominican Republic's Wellington Romero.

The Dominican fighter was simply dazzled by the sharp, accurate shots of the 24-year-old Ukrainian Light Weight, who turned a 9-1 advantage at the end of the first into a comfortable 15-3 victory at the end of three one-sided rounds.

Lomachenko is making his Olympic debut at Light Weight having won the Feather Weight title in Beijing, where he accumulated 58 points in his five bouts and conceded only 13, also winning the Val Barker Trophy for the best boxer of the tournament.

Lomachenko, also a two-time world champion, will next face Puerto Rican teenager Felix Verdejo Sanchez, who beat Tunisia's Ahmed Mejri 16-7, with at least a bronze medal guaranteed for the winner.

Cuba's fourth seed Yasnier Toledo Lopez did not have it all his own way against China's world number nine Liu Qiang, but produced the sharper work in a rather mundane affair to take the verdict 14-10.

Meanwhile, Great Britain's Anthony Ogogo produced arguably the greatest performance of his career to defeat Ukraine's reigning world champion Ievgen Khytrov via a nail-biting judges' decision to move within one more win of a Boxing medal.