The Senators dealt Karlsson and prospect forward Francis Perron to the Sharks. Ottawa gets forwards Chris Tierney and Rudolfs Balcers, defenceman Dylan DeMelo, prospect forward Josh Norris and two conditional draft picks. If San Jose re-signs Karlsson, Ottawa receives a conditional 2021 second-round selection — or a first-round pick (not lottery protected) if the Sharks reach the Stanley Cup final in 2019.