Trade Grades: Sharks earn A- for Erik Karlsson heist

The deal:
Sharks get: D Erik Karlsson, LW Francis Perron
Senators get: C Chris Tierney, D Dylan DeMelo, LW Rudolfs Balcers, C Josh Norris, conditional 2019 second-round pick, conditional 2019/2020 first-round pick, conditional 2021 second-round pick
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