Mike Fisher had two assists after picking up his first two points of the season Tuesday night in a 2-1 win over Washington, including his first goal of the season in overtime.
The Senators are 4-0-1 in their last five games following a four-game losing streak.
Arron Asham scored his first goal for Philadelphia, which lost its second in a row after a four-game winning streak and fell to 4-5-3 overall.