Bernard Lagat
Already a two-time Olympic medalist for Kenya in the 1,500 meters, the 37-year-old Lagat became a naturalized American citizen in 2004, but fell short of the podium in Beijing for his new country. In 2012, with a new focus on the 5,000 and medals in the event at the most recent world championships, Lagat again has an Olympic long-distance medal in sight.