Ku qor sii wadida cutubkan - Roberts wuxuu lahaa xirfad aad u guulaysatay oo saameyn ku leh dhalinyarada xulka qaranka Australia. Roberts waxay markii ugu horeysay ka ciyaartay ciyaaraha caalamiga ah ee 2009 FIBA Oceania Under-16 Championship ee Brisbane, Australia, halkaas oo ay ku qaadatay dahab waxayna xaqiijisay booska Australia ee furitaanka Under-17 World Championship sanadka soo socda. Roberts wuxuu Australia u matali lahaa FIBA World Championship ee Faransiiska halkaas oo Australia ay gashay kaalinta toddobaad. Tartankaan Roberts wuxuu celcelis ahaan helay 16.1 dhibcood ciyaar kasta. Kadib waxay u wareegtay inay matalaan Gems ee 2011 FIBA Under-19 World Championship
wadanka Chile. Tartankaan waxay ahayd gool dhaliyaha ugu sareeya ciyaar kasta, iyada oo dhaliyay 41 dhibcood oo ka dhan ah Japan. In kasta oo ay celcelis ahaan 15.9 dhibcood ku heleen ciyaar kasta koox xooggan oo Australiyaan ah, kooxda ayaa si dhib yar u seegtay naxaasta, iyagoo kaalinta afaraad galay.