Niger's Hamadou Djibo Issaka rows in the men's single sculls event at Eton Dorney during the London 2012 Olympic Games July 31, 2012. Djibo Issaka, the novice rower who has earned comparisons to the slow swimmer Eric "The Eel", vowed to improve on Tuesday after again finishing last in an Olympic semi-final that was some 28 seconds slower than his previous race. REUTERS/Darren Whiteside (BRITAIN - Tags: SPORT OLYMPICS ROWING)