2010-11: Mark Friedman played in two junior A games with the North York Rangers and skated for the Don Mills Flyers midget minor AAA team in the Greater Toronto Metropolitan league. He had no points nor penalties with the Rangers. In 30 games for Don Mills he scored 7 goals with 2 assists and 34 penalty minutes. He skated for the Flyers in the OHL Cup and had 3 assists and 6 penalty minutes in seven games. Friedman was selected by Windsor in the 13th round (255th overall) in the 2011 OHL Priority Draft.
2011-12: Friedman skated for the North York Rangers as a 16-year-old as North York reached the Ontario Junior Hockey League playoffs. He scored 9 goals with 18 assists and 44 penalty minutes in 48 regular season games and scored 1 goal with 3 assists in 4 playoff games. Friedman committed to playing college hockey at Bowling Green in 2014-15 in November and was selected by the Waterloo Black Hawks in the fourth round (53rd overall) of the 2012 USHL Entry Draft.
2012-13: Friedman was the second-leading scorer amongst defensemen for Waterloo in his first USHL season; trailing only Florida Panthers’ prospect Ian McCoshen. He scored 8 goals with 27 assists in 64 regular season games and was +22 with 44 penalty minutes. Waterloo finished third in the Western Conference. Friedman scored 2 goals with 3 assists and was +1 with 2 penalty minutes in the five-game, first-round playoff series against Fargo.
2013-14: Friedman returned to Waterloo for a second season and played a key role as the Black Hawks finished first in the Western Conference and reached the USHL’s Clark Cup finals. He scored 10 goals with 30 assists and was +22 with 30 penalty minutes in 51 regular season games and was minus-1 with 7 assists and 4 penalty minutes in 12 playoff games. Friedman was ranked 124th amongst North American skaters in the Central Scouting final rankings and was selected by Philadelphia in the third round (86th overall) of the 2014 NHL Draft.