 Nyorai kupfuurira kweiyi ndima - Muna 1975, Tonelli akakunda 100 m backstroke, 200 m backstroke uye 200 m butterfly zviitiko paAustralia Championships. Kunyange zvazvo akakunda mazita akawanda ega ega kupfuura gore rakapfuura, nguva dzake dzaive dzinononoka; akapedza madaro mu59.70 s, 2 m 10.50 s uye 2 m 10.00 s. Tonelli akanga ariwo rutivi rweboka reQueensland iro rakabudirira kudzivirira zita ravo re medley relay. Nokudaro Tonelli akasarudzwa nokuda kwe 1975 World ChampionshipsmuCali, Colombia. Akakurumidza kupinda mumakwikwi ekupedzisira emamita mazana maviri uye akanga aronga kutevera nzira ine utsinye yekurwisa kubva pakutanga. Zvisinei, akakurudzirwa kushambira zvine mwero muhafu yekutanga yemakwikwi nemurairidzi weAustralia Terry Gathercole kuitira kuti vakwikwidzi vake vakuru Matthes naJohn Naber vasakwanise kudhonza kumashure kwake mumatanho ekutanga. Nzira yacho yakadzokera shure uye Tonelli akapedza nemenduru yesirivha. Akanga achimhanya zvikuru muhafu yepiri yomutambo - chimwe chinhu chisingawanzoitiki mukushambira kwepamusoro uye chiratidzo chechikanganiso chemazano - uye akanzwa kuti akanga ane simba rakawanda risina kushandiswa rakasara pakupera kwomujaho. Tonelli akapika kuti kubvira panguva iyoyo zvichienda mberi, aizotsigira nguva dzose kufunga kwake namano ake orudzi. 