In the NBA Cup group stage, the Mavericks lost to the Clippers 127-133 in overtime.

After the game, Mavericks guard Russell was asked in an interview what he thought of Nico Harrison being fired. Russell replied: "This is part of the business. Players often go through this situation. When you see a general manager or owner change, you can only express understanding and move on. However, Nico is very good to me."

In this campaign, Russell played 39 minutes as a substitute, shooting 11 of 24, 0 of 6 three-pointers, 6 of 9 free throws, scoring 28 points, 6 rebounds, 5 assists, 2 steals and 7 turnovers.