In the NHL, a stat called PDO calculates a line's shooting percentage plus their save percentage. Over the long run, a line's PDO should normalize to 100, but we know this isn't always the case -- the higher the PDO, the luckier a line got, and vice-versa.

Similar to this article where we analyzed some lines that were unlucky last year, we will now look at three lines that had some good puck luck in 2016-17 and may regress a bit in 2017-18.