Markström, 34, is new in New Jersey after four seasons in Calgary.
He could hardly have gotten a better start.
The veteran from Gävle, with 15 seasons in North America, made a spectacular save.
Buffalo's Nicolas Aube-Kubel was about to shovel in an open goal – but Markström got out his stick and stopped the puck.
It was pure desperation. I was lucky and the puck hit my stick. It was good timing to have luck, says Markström according to the club's website.
Buffalo's star defenseman Rasmus Dahlin in Viaplay's broadcast:
He's a good goalie, it was a fine save. I don't know if it was luck or not.
Dahlin made his debut as team captain in Buffalo, but it was not a night to remember.
New Jersey took a 2–0 lead already in the first period and could sail away to a clear victory.
New Jersey's Swedish forward star Jesper Bratt was pointless.
Both Markström, who had three crowns on his helmet, as well as Bratt and Dahlin are chasing spots on Tre Kronor's squad for the big four-nation tournament in North America in February.
There, Sweden, Finland, Canada, and the USA will participate with pure NHL national teams.