Kammala jumla mai zuwa: DiPietro ya fara zama na farko a matakin matasa na Amurka a 1999 IIHF World U18 Championships. Daga nan zai taka leda a gasar zakarun duniya biyu masu zuwa a
2000 da 2001, an ba shi kyauta a cikin tsohon a matsayin mafi kyawun mai tsaron raga na gasar kuma an zaba shi zuwa All-Star Team.