NHL New York Islanders defenceman Matthew Schaefer has been awarded the Calder Memorial Trophy as the NHL's top rookie. Youngest-ever Calder Trophy winner set multiple league marks for 18-year-old Listen to this article Estimated 1 minute The audio version of this article is generated by AI-based technology. Mispronunciations can occur. We are working with our partners to continually review and improve the results. Matthew Schaefer, the first overall pick of the 2025 NHL draft, is the sixth Islander to win the Calder Trophy as the league's top rookie and youngest in NHL history at 18 years and 223 days. (Bruce Bennett/Getty Images) New York Islanders defenceman Matthew Schaefer has been awarded the Calder Memorial Trophy as the NHL's top rookie. Selected first overall in the 2025 NHL draft, Schaefer is the sixth Islander to win the Calder Trophy and the youngest winner in NHL history at 18 years and 223 days — surpassing Nathan MacKinnon (18 years, 224 days in 2013-14).…