Sweeping the Chicago Blackhawks in the opening round of the postseason was not enough for the Nashville Predators.

Taking on the St. Louis Blues to kick off the second round of the Stanley Cup playoffs Wednesday, the Predators got three points from defenseman P.K. Subban and hung on for a 4-3 road win over Jake Allen and the Blues.

The Pacific Division foes, meanwhile, also played Wednesday night as the Edmonton Oilers upset the Anaheim Ducks in the other West semifinal thanks to a four-point outing from Leon Draisaitl.

Here are a couple of things to note from Wednesday night's action:

P.K. Subban (and penalties) were downright dangerous against the Blues

The blueliner all but single-handedly erased memories of Allen's dominant first-round performance for the Blues.

Subban made his fair share of contributions in Nashville's rout of the Blackhawks, but on Wednesday, he ran the show. This decisive slapshot gave him his first playoff goal as a member of the Predators:

But it was hardly the end of his impact; St. Louis simply had no answer for Subban. The defenseman finished with two assists, one of which could've been labeled an alley-oop on a separate Predators goal, and drew a penalty to set up a 5-on-3 advantage for Nashville.

Penalties may have been the main reason outside of Subban's confident shooting that St. Louis was unable rally to a win. Four different penalty-induced disadvantages overshadowed the Blues' decent performance against Pekka Rinne.

The Oilers got plenty of offense from some unexpected contributors

Edmonton got all the help it could get in a 5-3 trouncing of the Ducks. Connor McDavid brought the name recognition to Anaheim, but it was Draisaitl, with a whopping four points, and the duo of Mark Letestu and Adam Larsson who really powered the Oilers to a big Game 1 victory -- Letestu hit a pair of goals, while Larsson connected on both his shots on goal from the blue line, including the go-ahead score in the third period that could've been missed in the blink of an eye:

Just as noteworthy as the Oilers' deep offensive attack on Wednesday? The fact that Edmonton owns an all-time playoff series record of 9-2 when it wins Game 1 on the road.

Kevin Fiala's injury was the scariest of the postseason

Fiala's crash into the boards -- seemingly in part made worse by a shoulder nudge from his opponent -- had everyone hoping for the best. Word was that the left winger was in stable condition after being carted off the ice with help from players from both sides, but his collision was violent nonetheless.