Dennis Matuch was inducted in the International Marathon Swimming Hall of Fame in 1977 as an Honour Swimmer. In 1962, the American swimmer won the 59K (36.75-mile) Lake Michigan Swim Challenge from Chicago to Waukegan, Illinois, USA in 21 hours. In the La Tuque 24-hour Marathon Swim in Canada, he was often sought as a partner in the two-person relay, swimming with Ted Erikson, Jon Erikson, Abou Hief and Diana Nyad. In 1963, Matuch broke the established world best time for a 40K (25-mile) pool swim in a time of 12 hours and 50 minutes. He competed in the 37K (23-mile) la Descente ou remontée du Saguenay race in 1966, 1967, 1968 and 1969.