Just thought that I would post these comments from Sebastian Pruiti about Burks and his defense. He has been a very good defender so far.
https://www.grantland.com/story/_/id/7498199/nba-rookie-rankings-iii-including-kyrie-irving-ricky-rubio-more
8. Alec Burks
Coming into the season, Burks was touted as a talented offensive player who struggled on defense. Burks' offense has been average so far this season, but he earned his first ranking here because of his defense. According to Synergy Sports, Burks has been holding the players he guards to 0.717 points per possession. That places him in the top 16 percent of all NBA players. Burks is particularly adept at chasing defenders around screens away from the basketball. In these situations, Burks holds opponents to 0.583 points per possession on 33.3 percent shooting. He uses his speed and size to stick close to his man and challenge shots. It has been impressive to watch Burks commit himself on defense, especially after being criticized before the draft for a lack of effort defensively. If his offense picks up, Burks should become a mainstay in these rankings.