Urho Vaakanainen, D:The 20-year-old, selected with the No. 18 pick in the 2017 NHL Draft, played two games for the Bruins last season, had 14 points (four goals, 10 assists) in 30 games for Providence of the American Hockey League, and helped Finland win the 2019 IIHF World Junior Championship with four assists in seven games. … Jack Studnicka, F:The 20-year-old has climbed Boston's prospect pipeline and may get a chance to compete for a place on the third or fourth line. Chosen in the second round (No. 53) of the 2017 draft, Studnicka finished his junior career with 83 points (36 goals, 47 assists) in 60 games for Oshawa and Niagara of the Ontario Hockey League last season and had 11 points (five goals, six assists) in 11 playoff games for Niagara. He also had two points (one goal, one assist) in four playoff games for Providence. … Karson Kuhlman, F: The 23-year-old undrafted free agent had three points (one goal, two assists) in eight playoff games, often skating on the second line with Jake DeBrusk and David Krejci, after he had five points (three goals, two assists) in 11 regular-season games. He scored to help the Bruins force Game 7 in the Cup Final against the Blues after not playing since April 30.