The Pittsburgh Penguins got back to playing the style that made them one of the NHL's best teams after Christmas.
New York's Thomas Hickey scored 12:31 into overtime to give the Islanders a 4-3 victory over Florida on Sunday, taking a 2-1 lead in their NHL first-round playoff series.
Washington's Braden Holtby made 41 saves while his opposing goaltender Philadelphia's Steve Mason gave up a goal from 101 feet away as the Capitals beat the Flyers 4-1 on Saturday to take a 2-0 lead in their NHL first-round playoff series.
Tampa Bay improved to 2-0 in its NHL Eastern Conference playoff series against Detroit by beating the Red Wings 5-2 on Friday, spurred by a couple of third-period goals from Tyler Johnson.
Washington frustrated Philadelphia by killing all of their power plays, and beat the Flyers 2-0 on Thursday in the opening game of their NHL Eastern Conference first-round playoff series.
Dallas clinched the NHL's Central Division title and top seed in the Western Conference playoffs by beating Nashville 3-2 on Saturday, finishing two points ahead of divisional rival St. Louis, which lost 5-1 at home against Washington.
Russia replaced its entire U-18 world ice hockey championship team on Friday to "minimize" the risk of testing positive for banned drug meldonium, sports minister Vitaly Mutko said.
Jordie Benn scored the tiebreaking goal with 4:58 to play as the Dallas Stars rallied from a third-period deficit to assert their Western Conference supremacy with a 3-2 victory over the Los Angeles Kings on Saturday.
Phil Kessel scored twice as the surging Pittsburgh Penguins moved within striking distance of a 10th straight playoff berth with a 5-2 win over the Nashville Predators on Thursday night.
Dallas and St. Louis both won in the NHL on Tuesday to keep pace with each other for the Western Conference lead as the regular season winds down.