Berlin: The middle-distance runners take centre stage at the world championships today. Gold medals will be on the line in the men`s 1,500 metres and the women`s 800 on the fifth day of competition in Berlin`s Olympic Stadium.
Jamaican 100 and 200 world record holder Usain Bolt also returns in the semi-finals of the 200 ahead of Thursday`s final.
Finals are also scheduled in the women`s 100 hurdles and men`s discus.
In the men`s 1,500 Kenyan Asbel Kiprop, who is likely to be upgraded to Olympic gold after 2008 Beijing winner Rashid Ramzi of Bahrain failed a doping test, is the favourite. Kenyan-born American Bernard Lagat is the defending champion.
South African Caster Semenya was fastest in women`s 800 qualifying. Kenyan world champion Janeth Jepkosgei is also through but countrywoman Pamela Jelimo, the Olympic gold medallist, failed to advance.