Alfredsson redirected Lance Pitlick's slap shot for Ottawa's sixth win in their last eight games. The win gives Ottawa the top spot in the Eastern Conference with 76 points. Magnus Arvedson, Bill Berg and Radek Bonk also scored for the Senators.
Ron Tugnutt was stellar in goal as he turned aside 33 shots. His best save came at 3:57 of the final period as Trevor Linden tried to tip the puck in from the slot. Tugnutt stuck his glove behind his back as he was falling and snared the puck.
Bryan Smolinski and Mark Lawrence scored for New York, who got 24 saves from Tommy Salo. The Islanders continue to falter against the Senators. New York is 0-10-3 in the last 13 meetings between the two teams. The Islanders' last victory over Ottawa was a 5-4 squeaker at home on Jan. 6, 1996.
Smolinski opened the scoring at 12:35 on a one-timer to the short side for his 11th of the season.
Lawrence put the Islanders up 2-0 at 14:54 on a power-play tip-in from the slot.
Ottawa scored twice in a 62-second span to tie the game. Arvedson dove to poke a loose puck that sat behind Salo into the net at 16:22, and Berg tied the game at 17:24 with his second goal this season when he roofed a rebound.
New York outshot Ottawa 14-9, but neither team scored in the second period.
After Alfredsson's goal, Ottawa held New York scoreless while Bonk iced the win with an empty net goal with 2.6 seconds left.
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