Button/By S. Bradley

The Bruins today signed prospect Ryan Button to a standard three-year entry-level contract.

He was their third-round pick (86th overall) in 2009.

Button, 20, played last season in the Western Hockey League for Seattle and Prince Albert before finishing up with Boston’s Providence (AHL) farm club on an ATO. He skated in seven games for the P-Bruins and recorded one assist.

•In other prospect news, the Bruins told forwards Zach Hamill and Kirk MacDonald, goaltender Michael Hutchinson and defenseman Yury Alexandrov they were no longer needed as ‘Black Aces’ that were skating in Providence to stay ready for a potential call-up.

The biggest surprise of the group, of course, is Hamill, who was Boston’s first-round pick (8th overall) in 2007. Hamill skated in three games for Boston this season (he recorded one assist) and has played in four career NHL games. For the P-Bruins he put up 14-30-44 totals in 75 games this season.

•Center Craig Cunningham, Boston’s fourth-round pick (97th overall), was traded this season from Vancouver to Portland in the WHL. He has to be happy about that deal now that he’s going to play in the 2011 WHL Championship series against Kootenay. That series opens Friday in Portland.

•Defenseman Marc Cantin, who skated for the Mississauga St. Michael’s Majors this season, was a Second Team OHL All-Star, as the league announced last week. Cantin was in the Bruins’ development camp last summer and signed a free agent deal with the team when his junior season was complete.