LAS VEGAS — Jack Eichel scored a power-play goal with 5.2 seconds remaining to give the Vegas Golden Knights a 2-1 win over the Ottawa Senators on Sunday night. Eichel, who was acquired Nov. 4 in a trade with the Buffalo Sabres and recently made his Vegas debut after having artificial disc replacement surgery, has three goals as a Golden Knight, including two game-winners. “That’s what you miss, just making a difference,” Eichel said. “You’re just trying to help the team win. As a competitor, you miss competing and being out there and having moments like that … helping win hockey games.” Jonathan Marchessault also scored for the Golden Knights. Robin Lehner made 39 saves and earned his 150th career win. Brady Tkachuk scored the lone goal for Ottawa, and Anton Forsberg made 40 saves. Vegas entered the game with the worst power play in the NHL since Jan. 24 at a bleak 5.4% (2 for 37) conversion rate and was already 0 for 1 in the game. Ottawa’s Thomas Chabot was called for trippi...