LONDON: Champions Tsegaye Kebede and Liliya Shobukhova will return to defend their titles at next year's London Marathon, organizers confirmed. Shobukhova, who led a Russian one-two in this year's women's race, heads a field that is being described as the best ever assembled on the streets of London. Ethiopia's Kebede will have stiff opposition from Kenya's Olympic champion Samuel Wanjiru in a lineup that reads like a who's who of marathon running.