Faatumu le fuaiupu lenei: I le masina o Fepuari 2015, na manumalo ai Derrick i lona tolu o tausaga sosoo o le US Senior Men 12,000 mita USA Cross Country Championships i le 36:18, i Boulder, Colorado, e agavaa ai mo le
2015 IAAF World Cross Country Championships i Guiyang, Saina, lea na ia tuu ai i le 24th.