"It's just nice to be out there again, absorbing contact," Tavares said. "You have offseason, then training camp, competing in practices, then get to play against opponents that aren't on your team. Some of that stuff is nice to get going. You want to do good things. And it's always good to get rewarded."
Tavares, who signed a seven-year, $77 million contract July 1 after nine seasons with the New York Islanders, was left alone in front of the Senators net and made a nifty move to beat Mike Condon for a power-play goal at 5:12 of the first period that tied the game 1-1.
"When you have a guy that has lots of skill and lots of determination, that can be a lethal combination," Maple Leafs defenseman Morgan Rielly said.
Mitchell Marner scored and assisted on each of Tavares' goals, the second at 6:06 of the third period when Marner fed Justin Holl at the point. Tavares, outmuscling defenseman Patrick Sieloff, put in the rebound of Holl's shot past Marcus Hogberg for a 3-1 lead.
Marner made it 4-1 at 11:48 of the third off an assist from Tavares.