Erik Karlsson isn't concerned with facing Pittsburgh's Matt Cooke in the second round of the playoffs. Cooke's skate cut Karlsson's Achilles tendon and the Ottawa defenseman missed 31 games after requiring surgery. "I don't have many thoughts," Karlsson said. "Whatever happened, happened. I'm back playing and it's not something I'm really thinking about." The offensively gifted blueliner generated one goal and five assists in the Senators' first-round series win over Montreal.