Boasted an impressive career during his years in Riverdale. In his first season, Walraven recorded one of the highest batting averages (.349) for all freshmen in the country. An outfielder, he was named All-Metropolitan in 1974 and 1976. As a senior, he harbored a .356 batting average, scored 19 runs and notched 32 hits. Walraven was named to the Manhattan College Dean's List several times, earned both the program's Outstanding Performer Award and Jasper Award.