Jonathan Marchessault had a goal and three assists, and Mark Stone had two assists for Vegas. Adin Hill made 22 saves.
Kevin Fiala and Matt Roy each had a goal and an assist, and Drew Doughty and Pierre-Luc Dubois each had two assists for Los Angeles. Cam Talbot made 28 saves.
Anze Kopitar gave the Kings a 1-0 lead 1:12 into the first period, finishing a give-and-go with Quinton Byfield.
Roy pushed it to 2-0 at 4:11 with a one-timer from the high slot.
Ivan Barbashev quickly responded at 5:24, cutting it to 2-1 on a deflection.
Viktor Arvidsson scored on a rebound on the power play to make it 3-1 at 8:38.
Chandler Stephenson scored his own power-play rebound goal to make it 3-2 at 19:08. Shea Theodore then tied it 3-3 at 6:55 of the second period when he roofed a backhand on a rush.
Fiala put the Kings back in front 4-3 at 15:48, but Nicolas Roy tied it 4-4 on a rebound at 3:27 of the third period
Eichel gave Vegas a 5-4 lead at 9:00, and Marchessault scored 37 seconds later to make it 6-4.
Eichel scored into an empty net at 19:04 for the 7-4 final.
