The fastest Ethiopian so far this year is Yenew Alamirew, who won in Rome in June in 12:54.95, the world's third-best time of 2013. Alamirew, who was 12th in the London Olympics, has won two Diamond League races this year. Fellow Ethiopian Hagos Gebrhiwet has also won a pair of Diamond League events and owns a season best of 12:55.73.
Other contenders may include Kenya's Thomas Longosiwa, who was third in London, Isaiah Koech, who placed fifth, and John Kipkoech, plus Ethiopia's Muktar Edris, the 2012 World Junior champion. Bernard Lagat, who took the silver in the Daegu World Championships, will shoot for another World Championship medal in Moscow, while fellow American Galen Rupp will seek his first.
The 2013 leader is Ethiopia's Dejen Gebremeskel, who moves up from the 5000 meters, in which he earned a bronze medal in Daegu and a silver in London. Gebremeskel ran his world-leading time of 26:51.02 in Sollentuna in June. Fellow Ethiopian Abera Kuma was second in Sollentuna and is second in the world with a time of 26:52.85. Kuma was fifth in the 5000 in Daegu.
Other top contenders should include defending World champion Ibrahim Jeilan, plus fellow Ethiopian Imane Merga, who earned the bronze in 2011. Kenyan competitors include Bedan Karoki, who was fifth in London, plus Kenneth Kiprop and Paul Tanui.
Other contenders may include Ethiopia's Feyisa Lilesa, who won the marathon bronze in Daegu, and Tadese Tola, plus Kenya's Bernard Kipyego – who took second in the World Half Marathon Championships in 2009 – Bernard Koech and Nicholas Kipkemboi.