What are the greatest sporting underdog stories?

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From Leicester City winning the Premier League to Eric the Eel competing at the 2000 Olympic Games, what are the greatest sporting underdog stories? Lee James, John Bennett and Mani Djazmi debate and discuss their big sporting shocks as Pafos FC of Cyprus, Norway's Bodo/Glimt, Kairat Almaty of Kazakhstan and Belgium’s Union Saint-Gilloise all make their Champions League debuts. Could any of them cause an upset?