On June 12, Punch Imlach of the Toronto Maple Leafs announced the formation of a new Metropolitan Jr.A league.
The Marlboros and Majors would be joined by promoted Junior B teams, the Whitby Mohawks, the Brampton 7Ups, and the Unionville Seaforths.
As opposed to the first season of the league, there was little effort to spread teams around the Toronto area, as Knob Hill, Neil McNeil and the Marlboros all called Maple Leaf Gardens home, usually playing doubleheader games on Tuesdays and Sundays.
In the 1962–63 J. Ross Robertson Cup series, the Niagara Falls Flyers defeated the Maroons 4 games to 2.
1962–63 standings Playoff results 1962/63 Metro Junior A League All-Star Teams First Team GP-G-A-P (age) Gary Dineen C Neil McNeil Maroons 38-32-63-95 (19) Mike Corbett W Neil McNeil Maroons 37-44-50-94 (20) Duncan MacDonald W Toronto Marlboros 26-20-15-35 (20) Jim McKendry D Neil McNeil Maroons 34-2-17-19 (16) Frank Ridley D Toronto Marlboros 39-11-39-50 (20) Dave Kelly G Knob Hill Farmers 3.85 GAA (19) Second Team Ron Ellis W Toronto Marlboros 36-21-22-43 (17) Terry Vail C Oshawa Generals 35-28-24-52 (20) Grant Moore W Toronto Marlboros 36-26-30-56 (19) Rod Seiling D Neil McNeil Maroons 38-29-48-77 (18) Bobby Orr D Oshawa Generals 34-6-15-21 (14) Gary Smith G Neil McNeil Maroons 2.35 GAA (19)