Marg uga menangake telulas medali ing ICF Canoe Sprint World Championships kanthi enem emas (K-4 500 m: 1978, 1979, 1983; K-4 1000 m: 1978, 1979, 1981), limang perak (K-2 500 m: 1975
, K-4 500 m: 1982, K-4 1000 m: 1975, 1982, 1983), lan loro perunggu (K-4 500 m: 1981, K-4 1000 m: 1973).