Mathew Barzal had two goals and an assist to help the Islanders rally for a 6-3 win over the Senators on Friday night at Barclays Center.
Josh Bailey had a goal and an assist, and Anders Lee, Johnny Boychuk and Casey Cizikas also scored for the Islanders, who came back from a pair of two-goal deficits to win for the fifth time in six games.
Thomas Greiss gave up three goals on 17 shots before he was pulled 6:11 into the second period. Robin Lehner, who began his career with Ottawa, came on and stopped all 10 shots he faced to improve to 7-0-3 against his former team.