 Nekuwana mukana wekuenda kumakwikwi ekupedzisira eJGP, Mroz akawana mukana wekuenda kumakwikwi e2008 US Championships. PaNational, Mroz akakwikwidza kechipiri padanho repasi. Akaisa yechitatu mupurogiramu pfupi uye yechipiri muhurongwa hwekusununguka kuhwina menduru yesirivha yakazara, 10.13 mapoinzi kumashure kwemakwikwi Rippon. Akazoiswa muchikwata che2008 World Junior Championships kwaakaisa 3rd muchirongwa chipfupi mushure mekumhara musanganiswa we3A-3T. Akaisa yechishanu mumutambo wakasununguka kuti aite wechina zvachose, achiisa 3.40 mapoinzi kumashure kwemenduru yegoridhe Guan Jinlin. 