It was Vejmelka’s second shutout of the season and eighth in the NHL.
Clayton Keller scored twice in the first period, and Barrett Hayton had a goal and an assist for the Mammoth (36-27-6), who have won back-to-back games after losing four in a row.
Akira Schmid made 14 saves in relief for the Golden Knights (31-24-14), who have been shut out in consecutive games at home. Adin Hill allowed three goals on all three shots he faced before Schmid replaced him.
Keller put the Mammoth ahead 1-0 at 2:52 of the first period after he slipped a shot underneath Hill’s right arm.
Keller added another goal at 6:05 to make it 2-0 after he roofed off a Lawson Crouse shot off the end board before Hill could get back into position.
Jack McBain pushed it to 3-0 at 8:12 with a one-timer from Hayton on the rush, which chased Hill.
Hayton added an empty-net goal at 19:12 of the third period for the 4-0 final.
