2009-10: Greg Chase skated for the Sherwood Park Flyers bantam AAA team in Alberta. In 38 games, including five playoff contests, he scored 47 goals with 45 goals and had 74 penalty minutes. Chase was selected by Calgary in the first round (22nd overall) of the 2010 WHL Bantam Draft.
2010-11: Chase made his WHL debut with Calgary as a 16-year-old and competed for Team Alberta in the 2011 Canada Winter Games in addition to playing for the J. Ennis Kings midget AAA team in Sherwood Park, Alberta. He played in three games with the Hitmen in January and two more in March; finishing with an even plus/minus with no points and 6 penalty minutes in five games. Chase scored 24 goals with 15 assists and 64 penalty minutes in 30 regular season games for the Kings. Sherwood Park reached the division finals after finishing fourth in the Dodge Division in the regular season. Chase scored 7 goals with 3 assists and had 36 penalty minutes in 12 playoff games. In five games at the CWG he scored 3 goals with 2 assists and had 12 penalty minutes as Team Alberta captured a bronze medal.
2011-12: Chase played 60 games for the Hitmen in his first WHL season and represented Canada Pacific in the 2012 U17 World Hockey Challenge. Chase scored 6 goals with 22 assists and was +2 with 41 penalty minutes. Calgary finished second to WHL champion Edmonton in the Central Division and reached the playoffs. Chase scored 1 goal with 1 assist and was -1 with 11 penalty minutes in the five game series with Brandon. In five games with Canada Pacific at the WHC he scored 1 goal with 5 assists and 8 penalty minutes.
2012-13: Chase was the fourth-leading scorer for Calgary; one of the WHL's top teams. He scored 17 goals with 32 assists in 69 games and was +11 with 58 penalty minutes. Calgary finished second to Edmonton in the Central Division and took the Oil Kings to seven games in the Eastern Conference finals. Chase scored 3 goals with 7 assists and was +1 with 24 penalty minutes in 17 playoff games. Ranked 153rd in Central Scouting's final rankings, he was selected by Edmonton in the seventh round (188th overall) of the 2013 NHL Draft.
While often noted first for being a pest, Chase is not without strong hockey sense and a bit of offensive flair. He’s big with good foot speed and never backs down from a tough battle in the gritty areas of the ice. He’s tough to knock off the puck, has good hands and sees the ice well. His on-ice attitude is often a bone of contention for some, but his intriguing offensive upside and raw talent make him a somewhat of a hidden gem for the Oilers as a deep draft selection.
Chase will return to his WHL team, the Calgary Hitmen for his second junior season in 2013-14.