- Finished sixth on the team (and second among Maple Leafs defencemen) with 31 points.
- Set a new career-high with four points (four assists) on December 21 at Colorado.
- Registered his 100th career NHL point on December 29 vs. New York Islanders.
- Skated in 300th NHL game on February 20 vs. Philadelphia.
- Scored the first overtime goal of his career on April 6 at Philadelphia.
- Missed three games due to an upper body injury. Returned to the lineup on October 30 at New York Rangers.
Season Stats: Home: 40 GP, 1-11-12 Road: 39 GP, 6-13-19
Career as a Maple Leaf: 325 GP, 28-92-120
WCHA All-Rookie Team (2009) WCHA Second All-Star Team (2011) NCAA West Second All-American Team (2011) NHL All-Rookie Team (2012)
Traded to Toronto by Anaheim with Joffrey Lupul and Anaheim's 4th round pick (later traded to San Jose San Jose selected Fredrik Bergvik) in 2013 NHL Draft for Francois Beauchemin, February 9, 2011.