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"They will be fine," coach Jon Cooper said.
Cooper said he isn't concerned with goalie Andrei Vasilevskiy, who allowed four goals on 25 shots and was pulled for backup Louis Domingue after the second period. Vasilevskiy, a Vezina Trophy finalist, entered the conference final with a .927 save percentage and 2.20 goals-against-average.
"Superman has kryptonite too," Cooper said. "We can't depend on him to stop the barrage of chances he was getting. We gave Washington more scoring chances in the second period than we gave Boston in four of the five games we played them, the entire game. So when you give up those chances, I look at [Vasilevskiy] and say, 'God, 4-2. How wasn't it 8-2?' That's the way I look at it."
Vasilevskiy is looking forward to a better performance in Game 2.
"They had pretty good chances last night, but anyway I gave up four and played two periods," Vasilevskiy said. "So I guess I have to be better next game."
Defenseman Victor Hedman said the Lightning need to improve defensively.
"A loss is a loss at the end of the day and we know we've got better in us," Hedman said. "We know they're a good team and they are a team that plays with a lot of speed, an up-tempo game. They caught us out of position a few times, but we've got to make sure that we focus more on staying composed out there."