Na manumalo foʻi Kreft i pine siliva e fitu i le ICF Canoe Sprint World Championships faatasi ai ma le lua i le K-1 500 m (1975
, 1979), tasi i le K-2 500 m (1975), ma le fa i le K-4 500 m mea na tutupu (1974, 1975, 1979, 1983).