Having just turned 24 in September, Connor Mackey is one of the oldest prospects on our list.
But he’s not in our top five by accident. Mackey signed in Calgary back in March after being courted by 28 of the NHL’s 31 teams as an undrafted free agent out of Minnesota State University, Mankato. The left-handed defenseman previously attended two NHL prospect development camps and emerged as a two-time Western Collegiate Hockey Association all-star.
This past winter, TSN’s Frank Seravalli called Mackey a “prized catch” for Calgary and “the No. 1 NCAA free agent available.