It's not technically do-or-die for the San Jose Sharks just yet, but a loss on Thursday to St. Louis and a 3-1 deficit in the series may be too much to overcome.
If the Sharks end up down three games to one in the best-of-seven series, taking three straight from the Blues, including two in St. Louis where the Blues were the second-best home team this season, could be next to impossible.
On the other hand, a win and a 2-2 series might give the Sharks the chance to catch St. Louis on its heels in an even series.
It's not do-or-die quite yet, but it might as well be.
What players and matchups should you keep your eyes on in Game 4 to either come up big or set a tone for the remainder of the series?