Roger Federer has "been around the block," as he puts it. He knows how to handle the big moments, playing for major titles, for the record books, for an exalted place in tennis history.

Sunday's Olympic gold medal singles match is something new even for him.

Michael Phelps walks away from the greatest Olympic career in history with no regrets, summing up a journey that yielded 18 gold medals in the simplest of terms: "I did it."

"Through the ups and downs, I have achieved everything I ever wanted to do," said Phelps, who has often voiced hopes that his legacy would be not just about medals, but about changing the face of swimming.

Germany finished the Olympics’ eight-day swimming program on Saturday without an Olympic medal for the first time in 80 years with changes promised ahead of Rio de Janeiro in 2016.

The German team will leave London without a single swimming podium placing for the first time since 1932 as ex-champion Britta Steffen missed bronze by seven hundredths of a second in the 50m freestyle final.

Great Britain won six gold medals and a silver on Saturday, capped by triumphs for poster girl Jessica Ennis and runner Mo Farah to make it their most successful day at a Games for 104 years.

The host nation could barely believe its luck as the rowers started the gold rush in the men's four and the women's lightweight double sculls.

Serena Williams clinched her first Olympic singles gold medal with a 6-0, 6-1 demolition of Maria Sharapova in the most one-sided women's final in the history of the Games on Saturday.

Williams' victory, which surpassed Suzanne Lenglen's 6-3, 6-0 win over Dorothy Holman in the 1920 final in Antwerp, is the culmination of a grass court campaign that also brought the American a fifth Wimbledon crown.

Great Britain reaped a record Olympic harvest at the London 2012 rowing regatta which concluded Saturday with the host nation claiming two of the four concluding finals.

Arguably the most successful day in British rowing history began with Alex Gregory, Pete Reed, Tom James and Andrew Triggs Hodge winning the country's fourth successive men's four title.

Wojdan Shaherkani became the first ever Saudi Arabian woman to compete at the Olympic Games on Friday and almost stole French heavyweight champion Teddy Riner's thunder.

Riner is the biggest star in the sport and has been totally dominant in the top men's division since the last Games.

American swimming icon Michael Phelps will bring the curtain down on his glittering Olympic career Saturday as attention turns to track and field and the most eagerly anticipated 100m in history.

After a slow start to his campaign, Phelps could well sign off with his fourth gold medal of the Games as he aims to consolidate his position as the most decorated Olympian in history.

Carmelo Anthony says the U.S. Olympic team of NBA stars was not trying to send a message to the original Dream Team when it scored the most points in a game in Olympic history in routing Nigeria 156-73.

But the Americans clearly sent a message to the basketball world on Thursday with an incredible shooting performance -- this team has bigger dreams than the 1992 originals and the skill to make them come true.

Berekum Chelsea takes the sharpest scoring boots in the 2012 CAF Champions League to Al Ahly of Egypt Saturday as Berekum Chelsea from Ghana seek to extend a fairy tale debut season.

The 24-year-old striker, a virtual unknown outside his homeland when the annual competition kicked off last February, has bagged 11 goals in six qualifiers and two group games ahead of the match day three Cairo showdown.