Haile Gebrselassie of Ethiopia celebrates his winning run in the Rock-N-Roll Marathon in Tempe, Arizona on January 15, 2006. (Photo by Glen Andrews/SPK/Allsports) Haile Gebrselassie completed a hat-trick of Dubai Marathon victories on Friday but the Ethiopian’s hopes of setting a new world record were dashed by a bad back. The world champion crossed the finish line in a time of 2:06:09, 14 seconds...