TORONTO — The Maple Leafs superstars John Tavares and Auston Matthews have been as good as advertised this season, and often even better.

But Mitch Marner, who came to this championship-starved city with high expectations after he was chosen with the No. 4 overall pick in 2015, has had a breakout year and made a case that he’s the most valuable Maple Leafs forward.

Marner, a 21-year-old winger, led Toronto in points this season and became the youngest player in Maple Leafs history to record 90 points, the first to hit that benchmark in 22 years.

Marner finished 11th in the N.H.L. with 94 points (26 goals and 68 assists), six points ahead of Tavares and 21 ahead of Matthews, who missed 14 games because of injury. Marner and Tavares play on the same line, and Marner was a key reason Tavares, in his first season in Toronto, had a career-high 47 goals this season.