Nicklas Backstrom, Alexander Semin, Jason Chimera and Mike Green also scored for the Capitals, who haven't lost since Jan. 12 at Tampa Bay.
Tobias Enstrom and Rich Peverley scored for the Thrashers, playing a day after trading scoring star Ilya Kovalchuk to New Jersey.
The 13-game winning streak is the NHL's longest since New Jersey won 13 in 2001. The last time a team had a longer streak was when Pittsburgh set the NHL record with 17 in a row from March 9-April 10, 1993.
The Capitals also matched the franchise record of 10 consecutive home victories in a half-empty Verizon Center. The game was announced as a sellout, but many fans stayed home as snowstorm hit the nation's capital.
DEVILS 4, MAPLE LEAFS 3
In Newark, N.J., Jay Pandolfo capped a three-goal outburst in the final 3:04 and New Jersey welcomed Kovalchuk by rallying for a victory over the stunned Maple Leafs.
The explosive Kovalchuk finished with two assists, but really wasn't much of a factor in the stunning comeback.
FLAMES 2, PANTHERS 1
In Sunrise, Fla., Ales Kotalik and Mark Giordano scored, and Mikka Kiprusoff made 12 saves in Calgary's victory over Florida.
HURRICANES 4, SABRES 3
In Buffalo, N.Y., Jussi Jokinen snapped a third-period tie and added an assist, and backup Manny Legace made 28 saves in Carolina's victory over Buffalo.
COYOTES 2, BLACKHAWKS 1 (SO)
In Chicago, Robert Lang and defenseman Adrian Aucoin scored in the shootout to give Phoenix the win over Chicago.