I have 6 stats I value when evaluating first round matchups:
1) Team shooting percentage - will you be able to cash in on enough of your chances
2) Team save percentage - saves nearly as much a team stat as an individual goalie stat
3) Power play opportunity differential - do you get the calls like Pittsburgh and Colorado or are you going to be fighting an uphill battle on special teams like Carolina
4) Penalty kill % - defense trumps offense in the playoffs
5) Top 4 defenseman total goals scored - that extra man on the rush that can finish is huge in the playoffs
6) Points per game last 25 - Have you been struggling or did your team hit its stride in the last third of the season
Based on these the best upset chance is the Blues over the Wild. Power play is a huge advantage for St. Louis. CHECK
Close matchups that should go the distance are the two involving Washington and Pittsburgh. They should both get their usual power play love that should keep them in the series, although I see them both going down in 7. Rangers CHECK, Panthers off by 1 game.
Colorado could definitely sweep Nashville, 1 win at most for the Preds. Its the only matchup where own team is superior in all 6 categories. CHECK Edmonton and Calgary are both solid favorites even though their opponents should get more PP chances. Offensively the Alberta teams are just much better. Expected less than 7 but got the winners right.
Carolina and Tampa both should get it done in 6. Off by 1 game apiece but the right choices. Some years there can be 4 or 5 upsets but this year I only see one with a couple of more game 7s thrown in.