Olympics wrap-up: Day 7

On Day 7, Great Britain continued to shine in the velodrome, as Victoria Pendleton won the women's Kierin and the British men took gold in the team pursuit. And in rowing, the UK's Katherine Grainger and Anna Watkins won the double skulls.

In the Olympic Stadium, the first medal was won by Poland's Tomasz Majewski in the men's shot put. And after four events, Britain's Jessica Ennis has a commanding lead in the heptathlon going into Saturday's final three events.

In swimming, Michael Phelps won yet another gold medal in the 100-metre butterfly. But other finals weren't so predictable, as France's Florent Manaudou won a lightning-fast 50-metre freestyle gold. And America's Katie Ledecky came out of nowhere to win the women's 800-metre freestyle, very nearly breaking the world record.

Roger Federer and Andy Murray won their tennis semifinals on Friday, so will meet in Sunday's Olympic gold medal match - as they did in last month's Wimbledon final. In the women's final, Maria Sharapova will face Wimbledon champion Serena Williams.

Cuba's Leuris Pupo won a surprise gold in the men's rapid-fire pistol event. China's Dong Dong won the men's trampoline gold. And Polish weightlifter Adrian Zielinski took gold in a tiebreaker because he weighed just 130 grams less than his opponent.

At the end of Day 7, China remains atop the medals chart with 43 medals, 21 of them gold. The USA is still in second with 20 golds and Korea is still third with 9.

There are 22 gold medal events on Saturday, the biggest day of the Games, and London is celebrating the weekend with a massive arts festival that includes a variety of free film, theatre, art and pop-up events. Medals will be awarded in swimming, athletics, track cycling, women's triathlon, tennis, rowing, badminton, trampoline, weightlifting, fencing and shooting.