The Anaheim Ducks were the first NHL team to 50 points this season, after they edged Pacific rivals the San Jose Sharks 3-2 in overtime.
The Ducks (51 points) increased their buffer on the second-placed Sharks (43) after Ryan Kesler's goal in the first minute of the additional period at Anaheim's Honda Center.
Rickard Rakell's second-period goal put the hosts ahead in the second period but two Sharks goals in six third-period minutes - from Joe Pavelski and Melker Karlsson - had the visitors on track for a sixth straight win.
But Cam Fowler's equaliser with little over four minutes to play, plus Kesler's clutch goal sent San Jose to a streak-breaking defeat.
The Vancouver Canucks (42 points) and Los Angeles Kings (41) are third and fourth respectively in the Pacific.
The Canucks piled on the goals in a 7-1 rout of the Arizona Coyotes, with Alexandre Burrows scoring twice to help Vancouver to a 5-0 lead.
Daniel Sedin and Brad Richardson (both one goal, one assist), and Henrik Sedin (two assists) earned multiple points in Vancouver's first consecutive wins since December 5.
The Kings blew a 3-0 lead at home to the Calgary Flames, who stormed to a 4-3 overtime victory on the back of a Johnny Gaudreau hat-trick.
Gaudreau struck twice late in the third period to seal his remarkable treble, before Mark Giordano's OT winner.
The Pittsburgh Penguins' lead atop Metropolitan division is just three points, after they were denied in a shoot-out 4-3 by the Florida Panthers.
The Penguins forced an extra period when each of Nick Spaling and Evgeni Malkin scored inside the final five minutes but Aleksander Barkov's goal in the seventh round of the shoot-out sent the two points Florida's way.
The Nashville Predators moved back within two points of the Central-leading Chicago Blackhawks, after thrashing the Columbus Blue Jackets 5-1.
There were no goals inside the game's opening 27 minutes but, 21 minutes of game time later, the Predators were 5-0 up - with Craig Smith on target twice.
The Washington Capitals are third in Metropolitan, after a 2-1 win over the Ottawa Senators.