 Complete the following phrase:  Karlsson was selected as the tournaments best defenceman at the 2008 IIHF World U18 Championships. He was the tournaments a hrefPlus-minus2028ice20hockey29plusminusa leader with a plus eight rating. He led team Sweden in assists, finishing third overall in the tournament with seven in six games, which also tied him for first place in defencemen scoring. During the 2008 U20 4-Nations tournament which Sweden won, Karlsson scored one goal and one assist which tied him with David Rundblad, Viktor Ekbom and Tim Erixon as Swedens defenceman scoring leader. At the 