Schwartz scored a 5-on-3 power-play goal 2:19 into the third period to make it 4-0 before completing the hat trick at 16:02 on a one-timer to make it 5-0. He has 12 goals in 18 playoff games after scoring 11 in 69 regular-season games.
"We've seen it before from him," Blues coach Craig Berube said. "He's been a pretty consistent performer over the years. It was an off year for him, obviously, in the regular season, but the guy keeps working hard. Nothing changes with his attitude. He keeps with it and keeps working and it's paying off now. He's been a very good performer for us in the playoffs."
When a conference final/semifinal is tied 2-2, the winner of Game 5 has a series record of 19-8 (70.4%).
"Obviously, it's something that everyone's worked for and dreamed about, so you don't want to look too far ahead," Schwartz said. "We all know how important and how hard that last win is going to be."