The UBS Arena crowd was chanting Mathew Schaefe r’s name. In a game featuring three of the NHL’s bright young talents, the No. 1 overall pick stood out with a goal and an assist in his historic performance as he became the youngest defenseman in league history at 18 years, 46 days to score the winner.

“His most complete game,” coach Patrick Roy said. “He was good offensively and defensively.”

Yet the Islanders would not have extended their winning streak to three games with a 4-3 victory over the winless Sharks on Tuesday night without Ilya Sorokin’s best outing of the season.

Sorokin made 33 saves for the Islanders (3-3-0), who were downright terrible in turning the puck over in the first period despite taking a 3-2 lead.

He stopped 14 shots in the first period and made two key

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