Dina Pébruari 2015, Derrick meunang katilu kalina berturut-turut AS Senior Lalaki 12.000 méter AS Cross Nagara Championship di 36:18, di Boulder, Colorado, pikeun cocog pikeun 2015 IAAF World Cross Nagara Championship
di Guiyang, Cina, dimana anjeunna nempatkeun 24th.