Rubuta ci gaba don wannan sakin layi - Ta kasance memba na ƙungiyar Slovenian biathlon daga 2002 zuwa 2017, kasancewar ta kasance mai tsere na ƙasa kafin hakan. Sakamakonta mafi kyau a gasar cin kofin duniya ta Biathlon ita ce ta biyu a tseren mutum na kilomita 15 a Gasar Cin Kofin Duniya
wanda aka gudanar a Pyeongchang, Koriya a lokacin kakar 2008/09. A Gasar Cin Kofin Duniya ta 2012, Gregorin ya lashe lambar azurfa a tsere mai gauraye, tare da Andreja Mali, Klemen Bauer da Jakov Fak.