28 July to 5 August.
Novak Djokovic: In an era that was all about Roger Federer and Rafael Nadal, Djokovic has emerged from their shadow and taken the sport to new heights. He narrowly failed to win a fourth consecutive grand slam final at the French Open earlier this year but remains a commanding world number one and the man to beat.
Venus Williams: The only woman ever to win three Olympic gold medals in tennis. Williams beat Elena Dementieva to win the singles title in Sydney in 2000 and then made it a golden double by winning the doubles with sister Serena. The Williams sisters won doubles gold again in Beijing.
Roger Federer: It seems slightly odd to describe an Olympic gold medallist as a flop but, given his phenomenal achievements in the sport, failing to win a singles medal in three attempts is a surprise. His best effort was fourth place in Sydney, but he did win an emotional doubles gold with Stanislas Wawrinka in Beijing.
DID YOU KNOW?
Steffi Graf is the only player to have achieved the so-called Golden Slam, winning all four grand slam titles and Olympic gold in the same year, which she managed in 1988. Graf's husband, Andre Agassi, is one of only two other people who have won all five titles in their career, along with Rafael Nadal.
FIRST APPEARANCE AT GAMES