Western Collegiate Hockey Association (WCHA) Rookie Team as a forward. Colborne improved to 41 points as a sophomore in 2009–10 and led the team with 22 goals. He was named a WCHA Third-Team All-Star, and the Pioneers won the MacNaughton Cup as WCHA regular season champions. The Pioneers' were upset by the RIT Tigers in the first round of the 2010 NCAA Division I Men's Ice Hockey Tournament. Following the loss, Colborne chose to forgo his final two years of college eligibility and signed a three-year contract with the Bruins. He was assigned to the American Hockey League (AHL)'s Providence Bruins to complete the season where he recorded two assists in six games. Professional Colborne joined Providence full-time for the 2010–11 AHL season and the Bruins projected that he could become a player capable of playing on the top two lines at either centre or wing. Toronto Maple Leafs However, after appearing in 55 games for Providence in which he scored 12 goals and 26 points, Colborne was sent, along with two draft picks, to the Toronto Maple Leafs in exchange for Tomáš Kaberle on February 19, 2011. The Maple Leafs assigned him to their AHL affiliate, the Toronto Marlies, where he played an additional 20 games. He was recalled to Toronto for the final game of the 2010–11 NHL season and made his NHL debut on April 9, 2011. He recorded his first point in the game, assisting on Phil Kessel's goal in a 4–1 loss to the Montreal Canadiens. Colborne spent the majority of the 2011–12 season with the Marlies; he appeared in 69 AHL games and recorded 39 points. He also appeared in 10 games with the Maple Leafs and scored his first NHL goal on November 22, 2011, against goaltender Dwayne Roloson of the Tampa Bay Lightning. Colborne spent the majority of the 2012–13 AHL season with the Marlies, where he improved to 42 points in 65 games. He also appeared in five NHL games with Toronto. Calgary Flames During training camp prior to the start of the 2013–14 season, Colborne was again traded. The Maple leafs sent him to the Calgary Flames on September 29, 2013, in exchange for a fourth round selection at the 2014 NHL Entry Draft. Colborne was excited to be dealt to his hometown team and described former players Al MacInnis, Joe Nieuwendyk and Jarome Iginla as his heroes; "So to