Hartman, who was chosen No. 30 by the Blackhawks, has 10 goals and a team-leading 21 points in 20 games with the Plymouth Whalers in the Ontario Hockey League this season.
Last season he had 23 goals and 60 points in 56 games with Plymouth and had three points in seven games to help the United States win the gold medal at the 2013 IIHF World Junior Championship in Ufa, Russia.
There was a lot of talk off the ice. From a player's standpoint, that's not the talk in the room. GMs make decisions, coaches make decisions, but as a team you have to come together and be ready to go, and we are.
— San Jose Sharks forward Tommy Wingels on his team's approach entering training camp