Because of Rielly's offensive prowess and commitment to defense, he was chosen by a panel of 20 NHL.com writers to win the Norris Trophy at the midway point of the season. He received 77 points, including 11 first-place votes, edging Giordano, who had 73 points and six first-place votes. Seth Jones of the Columbus Blue Jackets (two) and Roman Josi of the Nashville Predators (one) received the other first-place votes.
"He's still learning, playing defense is a lot harder than playing wing in the National (Hockey) League, takes more time," Maple Leafs coach Mike Babcock said of Rielly. "Just the idea of boxing out and facing the puck, and knowing when to go and when to stay home. He's done a real good job, and obviously he's an elite player for us."
Rielly, who is averaging 22:27 of ice time per game, leads the Maple Leafs in total ice time (942:50) and power-play ice time among defensemen (2:39 per game). He is often matched against the opponent's best players, and his plus-minus rating is an indicator of his success against them.
"He's coming obviously, he keeps getting better, he's still a kid," Babcock said. "It's hard to be real consistent and real good defensively and offensively every night in the National League when you're a kid on the back end."
Toronto is 10-2-0 when Rielly scores a goal this season. He is on pace to break the Maple Leafs record for points in a season by a defenseman (Ian Turnbull had 79 in 1976-77) and could be the first Toronto player to win the Norris Trophy.
Rielly said he doesn't think he's reached his full potential yet.
"I feel like I've got room to get better," he said. "It's not just me, I know there's other guys that feel that way. So moving forward in the last half of the year, we all feel like we can get better and be more consistent as a team."
Voting totals (points awarded on a 5-4-3-2-1 basis):Morgan Rielly, Maple Leafs, 77 points (11 first-place votes); Mark Giordano, Flames, 73 points (six first-place votes); John Carlson, Washington Capitals, 42 points; Seth Jones, Blue Jackets; 22 points (two first-place votes); Brent Burns, Sharks, 22 points; Kris Letang, Pittsburgh Penguins, 21 points; Roman Josi, Predators, 11 points (one first-place vote); Thomas Chabot, Ottawa Senators, 10 points; Victor Hedman, Tampa Bay Lightning, 10 points; Ryan McDonagh, Lightning, 5 points; Ryan Suter, Minnesota Wild, 2 points; Drew Doughty, Los Angeles Kings, 2 points; Erik Karlsson, Sharks, 2 points; Rasmus Ristolainen, Buffalo Sabres, 1 point
NHL.com correspondent Dave McCarthy contributed to this story