The Blues are ranked 10th on the power play at 22.4 percent and 10th on the penalty kill at 81.2 percent.
St. Louis has also actually outscored opponents 25-21 in the first period and 24-21 in the second period.
It is the third period and overtime that have been problematic. Opponents are outscoring the Blues 28-18 in the third and 3-0 in overtime.
"We could be talking about St. Louis in a month and everybody could be speaking about how great they're playing," Blashill said. "It's going to be a heck of a challenge for sure."
Ryan O'Reilly, the former Buffalo Sabre acquired in a trade, has 12 goals and 14 assists in 22 games and Vladimir Tarasenko has seven goals and 11 assists in 22 games.
"Obviously, it's going to be hard," Anthony Mantha said. "We need to be sharp when they're on the ice and we need to be aware of where they are. Obviously, they're two great players and it'll be the same mentality as playing (Buffalo's Jack) Eichel or guys like that. We just need to be sharp and ready."
Goaltender Jake Allen is expected to start for the Blues. He is 6-6-3 with a 3.27 goals-against average and .896 save percentage. Backup Chad Johnson is 2-5-0 with a 3.12 goals-against average and .895 save percentage.
"I think it's just a key of putting pucks on net for us," Mantha said. "I think their goaltending had their ups and downs this season, so hopefully we can get a couple through them tonight."
MANTHA HEATING UP: Mantha had a slow start to the season with just three goals in October and was moved to the fourth line.
But since getting moved back onto Dylan Larkin's line against the Dallas Starts on Oct. 30, Mantha has heated up.
In his last eight games, Mantha has six goals and three assists.
"Obviously, things are going my way right now," Mantha said. "Hopefully, they keep going. Working hard, putting a lot of pucks on net and trying to battle back. Obviously those 12-13 first games were hard, just eating dashes one after the other. I tried to make my way back up right now."
Against the Columbus Blue Jackets Monday, Mantha had a career-high 10 shots.
Larkin has been fairly steady all season but it now seems that he and Mantha have created a bit of chemistry.
"I would say finally," Mantha said. "Obviously, last year we had a couple games together. They had their ups and downs earlier this year. I wasn't on my game, so it wasn't really going well and now that we're both going really good hopefully Abby (Justin Abdelkader) can join in and be a great first line here."
Blashill said Tuesday that Mantha has been skating very well since he was reunited with Larkin.
"This is the best I've seen them together," Blashill said. "We've tried it at different times and it's been OK. They're really starting to build some chemistry together and I think they've been real dynamic together. This has certainly been the best stretch of games they've played together. Even (Monday) night, in our scoring chances plus-minus, they both had huge pluses. They were certainly two positive impacts on the game (Monday) night."
BERTUZZI BOBBLEHEAD REVIEWS: The first 7,500 fans at Little Caesars Arena for the Wings' showdown with the Blues will get a Tyler Bertuzzi bobblehead doll.