Alan Quine's power-play goal at exactly 16 minutes of the second overtime gave the New York Islanders a 2-1 victory over the Florida Panthers early Saturday in Game 5 of the Eastern Conference quarterfinal series.
Tampa Bay became the first team to book its place in the last eight of the NHL Stanley Cup playoffs after beating Detroit 1-0 on Thursday to seal a 4-1 series victory.
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.