From 2020:
“In just under 25 minutes of defensive matchup time against the league's top five scorers - James Harden, Giannis Antetokounmpo, Luka Doncic, Trae Young and Bradley Beal - Dunn has held them to 42.9% shooting (12-28) from the field and 23.1% (3-13) from 3-point range. Dunn has forced nearly as many turnovers (11) as he has allowed made baskets (12) from players averaging 27.8 points per game or higher.
Dunn was touted as a strong defender when he entered the NBA as a top five pick in 2016 and has lived up to that reputation. The 6-foot-3 guard has a 6-foot-9.5 inch wingspan, quick hands and elite quickness that allows him to be a defensive nuisance. His physical abilities combined with strong instincts have helped Dunn rank third in both deflections (3.9 per game) and steals (2.0) per game this season.
The Chicago Bulls rank seventh in defensive rating (105.6 points allowed per 100 possessions) and are even better with Dunn on the court. Dunn's 101.2 defensive rating ranks 17th in the NBA among 230 qualified players that have played at least 10 games and average 20 minutes per game. And Dunn's defense not only forces opposing scorers to work harder to put up their points, but it also fuels Chicago's offense by way of creating turnovers.”