Athletes from 53 African countries have been arriving in London ahead of Friday's opening ceremony for the 2012 Olympic Games. So who among the continent's sportsmen and women are likely medal contenders?

BBC picks the 10 African Olympians are in with a chance:

   Segun Toriola - Nigeria

   Sport: Table tennis

 

Segun Toriola from Nigeria

 Segun Toriola is Africa's most-decorated table tennis player. London 2012 will be his sixth Olympics - his first was Barcelona 1992. In Beijing four years ago, he became the first African so far to make it to the quarter-finals. The youngest of nine brothers, he plays professionally in France. A former Commonwealth champion, he has also won every major honour in Africa, dominating the sport there for nearly two decades. But at the age of 38, London 2012 could well be his last Olympics.