Some fans brought signs supporting Golden Knights goalie Carter Hart, and the Vegas crowd generally welcomed him from the moment he skated onto the ice.
Alex Ovechkin had his 33rd career hat trick to tie Brett Hull for fourth in NHL history and added an assist as he moved past Joe Sakic into 10th on the points list.
Jonathon Drouin and Emil Heineman also scored for the Islanders (10-6-2) in their fourth straight win, and Tony DeAngelo had two assists. David Rittich stopped 27 shots -- including all 16 after the first period.