Marner gave Toronto a 4-0 lead with his 11th goal of the season, scoring on a slap shot after a Los Angeles turnover inside its blue line.
Marner became the 10th player in the past 35 years to string together a streak of 21 or more games. He has 10 goals and 16 assists during the run.
Toronto has won seven of eight to improve to 17-5-6.
Los Angeles dropped to 14-11-4 with its seventh loss in 10 games. Kings goalie Jonathan Quick made 36 saves.
Kings: At Montreal on Saturday night.
Maple Leafs: Host Calgary on Saturday night.
AP NHL: https://apnews.com/hub/nhl and https://twitter.com/AP_Sports
The Associated Press