In a season in which Vancouver Canucks center Elias Pettersson garnered most of the headlines among rookies, Dahlin held his own while playing in a top-four role.
Although he continued to develop over the course of the season, Buffalo (33-39-10) faded and failed to make the Stanley Cup Playoffs, finishing 22 points behind the Columbus Blue Jackets for the second wild card from the Eastern Conference.
The Sabres, who haven't made the playoffs since 2011, fired coach Phil Housley on Sunday after two seasons. A replacement has not been named.
Through all of that, Dahlin showed flashes of his game-changing skills that should become more pronounced as he matures.
"It's been such a joy watching him this year, and I know our coaches love interacting with him. He's looking for knowledge. He's looking for information to get his game better," Sabres general manager Jason Botterill said. "Just his work ethic after practices, working on his game, whether it's his shot, whether it's leverage down low, working on picking guys' sticks up in front of the net, he's always working with our coaching staff on those little details."
Dahlin, who was selected with the No. 1 pick in the 2018 NHL Draft, was the fifth defenseman in NHL history to record at least 30 points before his 19th birthday (53 games), and his four game-winning goals were an NHL record for an 18-year-old defenseman.
"He doesn't make the same mistake twice, he learns from his mistakes very quickly," Botterill said. "He handled matchups very well on the road and you can see the smoothness. It didn't always result in points, but how he ignited our transition game and how he made that first pass out of the zone was a huge advantage for our team."