Kammala wannan jumla: 2011 ya ga Harrison ya shiga cikin manyan matakai. Ya lashe gasarsa ta farko a gasar cin kofin duniya ta UCI Track a Beijing, inda ya lashe omnium. Farkon fitowar Harrison a gasar zakarun duniya ta UCI ya zo ne a
2011, wanda ya lashe lambar tagulla a matsayin wani ɓangare na Team Pursuit. An zaba shi a wasan karshe bayan da Ed Clancy ya kamu da rashin lafiya. Harrison kuma ya gama 11th a cikin omnium.