Ales Hemsky also scored and had two assists and Matt Kassian added an empty-net goal for the Senators, who were eliminated from postseason contention after Columbus posted a 4-3 overtime victory over Phoenix on Tuesday.

Frans Nielsen scored his career-best 25th goal for the Islanders, who wrapped up their home season with a 13-19-9 record. Anders Nilsson stopped 28 shots in his second consecutive start.

Spezza opened the scoring on a power play 12:45 into the second period, blasting a one-timer from the right faceoff circle that trickled past Nilsson. Neilsen knotted it 22 seconds into the third period, collecting a rebound in the slot and firing a backhand shot past Anderson.

Spezza struck again exactly 20 minutes after his first goal, sending a quick wrist shot into the top corner. Hemsky put the Senators up by two goals at 14:26 of the third by speeding around the Islanders defense and flipping a shot over an outstretched Nilsson.

GAME NOTEBOOK: Islanders LW Brett Gallant made an impression in his NHL debut, knocking down Kassian with one punch during a fight in the first period. … The Islanders finish their season with road games at Montreal, New Jersey and Buffalo. ... Ottawa Ds Colin Greening and Jared Cowen sat out with lower-body injuries.