Karlsson finished Saturday's game against the Bruins with a team-worst minus-4 rating and three giveaways. While plus/minus rating is far from a perfect statistic to gauge a player's performance, Karlsson's minus-4 Saturday was well-deserved. His turnover in the second period resulted in Matt Fraser's first goal of the evening, and his poor defensive positioning a few minutes later resulted in Fraser's second snipe. Karlsson then carelessly gave away the puck in the third period, resulting in an uncontested blast from the point by Dennis Seidenberg for Boston's fourth goal. The blueliner is a breathtaking talent on the offensive end and an asset for fantasy owners, but as Saturday's performance showed, he's occasionally liable to cost the Senators a game.