Ville Peltonen and Juraj Kolnik also scored for the Panthers, who are 7-1-2 in their last 10 home games. Chris Clark, Alex Ovechkin and Dainius Zubrus scored for Washington, who are 2-7 in its last nine outings.
Ovechkin scored for the fourth consecutive game and extended his point streak to 13 games, the longest in the NHL this season. He leads the league with 33 goals.
The Panthers beat Washington for the third time in 19 days.
Ed Belfour stopped 27 shots and improved to 20-6-2 against Washington. Olie Kolzig made 26 saves for the Capitals.