De Bruin was Holland's leading discus thrower and shot putter in the 1980s and early 1990s. He participated in the 1984 and 1988 Summer Olympics, reaching 8th places at the 1984 shot put, and 9th place at the 1988 discus throw event. He was most successful in discus throw, winning silver medals at the 1989 Summer Universiade and 1990 European Championships, and a silver medal at the 1991 World Championships.