All this less than a year after the Senators came within one overtime goal against the Pittsburgh Penguins of reaching the Stanley Cup Final.
In a season of dealing with healing ankles and sore throats, give the defenseman credit for embracing the opportunity to represent Ottawa at the 2018 Honda NHL All-Star Game on Jan. 28 (3:30 p.m. ET; NBC, CBC, SN, TVA Sports). He only hopes his voice will have recovered by then.
"It's a great event," Karlsson said. "I always enjoy taking part. It's nice that it's going to be in Tampa. I have a lot of friends down there and guys who are going to be playing in that too.
"But I'm going to enjoy this break we have right now first."
The Senators do not play again until Jan. 18 when they host the St. Louis Blues. At that time, they hope to build off the modest momentum they've built in recent times.
Indeed, the six-goal loss to the Blackhawks is the only blemish they have in their past four games (3-1-0). Included are victories over the Maple Leafs, San Jose Sharks and Tampa Bay Lightning, teams that are in the top half of the NHL standings.
For forward Matt Duchene, this was his first taste of the Battle of Ontario. A native of Haliburton, Ontario, located about 125 miles north of Toronto, he grew up watching the heated Maple Leafs-Senators playoff series of the early 2000s.
"They were great," said Duchene, who was acquired from the Colorado Avalanche on Nov. 5 in a three-way trade that also included the Nashville Predators. "I have to admit I cheered for Ottawa at the time."
Duchene had two assists against the Maple Leafs, including setting up Tom Pyatt's winning goal with 3:05 remaining in the third period.
"Being able to play in one of these is special," Duchene said. "And to win it says a lot about our team."
The victory was the fifth consecutive one for the Senators at Air Canada Centre, their longest-ever win streak there. Maybe playing in Toronto is the perfect elixir for what's been ailing Karlsson and the Senators.
Just don't ask Karlsson to comment on it in the next couple of days. In this, his self-admitted weirdest of seasons, he and his beleaguered voice are enjoying some much-needed R&R.