Cika wannan jumla: Jefferis ya wakilci Australia a gasar 2002,
Wasannin Commonwealth na 2006 da 2010. A Wasannin Commonwealth na 2006, ya sami lambar zinare a wasan maza, lambar zinare a cikin zobba, da lambar azurfa a gasar ƙungiya. A Wasannin Commonwealth na 2010, ya taimaka wa Ostiraliya ta lashe lambar zinare ta farko a wasan rukuni na maza, kuma ya ɗauki zinare na mutum a kan sanduna masu daidaituwa da tagulla a cikin taron duka. Ya yi gasa a Gasar Cin Kofin Duniya a 2003, 2005, 2006, 2007, 2010, da 2011. A Gasar Zakarun Turai ta 2003, shi ne ƙarami a cikin 'yan wasan Australia. Kyakkyawan aikinsa a Duniya shine na goma sha biyu a cikin duk gasar a shekara ta 2006.