He scored the series-winning goal in the 4-3 win, which is about all you need to do get a first star in my opinion. But if that's not enough, he also had an excellent game all-around, finishing a team-high plus-7 in even-strength Corsi (plus/minus for shots attempted) in a game where the Penguins were outshot 38-21.
No. 2 Star: Evgeni Malkin, Pittsburgh Penguins
Malkin drew criticism for his defensive play at times, but he also had two assists, creating both the Penguins' game-tying and game-winning goals. On the winner, he forced the Islanders to collapse to the net before feeding Tyler Kennedy, who had all the time in the world to set up Orpik. And on Martin's, he made the pass himself. Plus he headed this puck to himself: