Ku sii qor faqradan - Mantzaris wuxuu xubin ka noqday xulka qaranka ragga sare ee kubadda koleyga ee Griiga sanadkii 2011. Wuxuu xubin ka ahaa xulka qaranka ee da'da weyn ee Giriigga oo ka ciyaaray 2012 FIBA World Olympic Qualifying Tournament, 2014 FIBA World Cup, iyo EuroBasket 2015. Wuxuu sidoo kale ka ciyaaray 2016 Turin FIBA World Olympic Qualifying Tournament
, iyo EuroBasket 2017.