Arizona Coyotes defenseman Jakob Chychrun underwent knee surgery Thursday and is out indefinitely, the team said. The 19-year-old Chychrun, selected 16th overall in the 2016 NHL draft, suffered the unspecified injury during offseason training and is expected to recover fully, the team said. read more http://www.espn.com/nhl/story/_/id/20244302/arizona-coyotes-defenseman-jakob-chychrun-knee-surgery