DALLAS — Alex Chiasson scored two goals and the Dallas Stars earned a 5-1 preseason victory over the Colorado Avalanche on Thursday.Kari Lehtonen made 25 saves for the Stars. Chiasson opened the scoring 55 seconds into the game. He picked up his third goal of the preseason at 6:30 of the third period on a power play. Erik Cole and Valeri Nichushkin also scored for the Stars. Alex Goligoski added a goal and two assists. Tyler Seguin and Ray Whitney both had two assists for Dallas. Jamie McGinn scored for Colorado. Briefly • Panthers: A person familiar with the situation says the Florida team has been sold to New York businessman Vincent Viola. The person says Viola will be introduced Friday and is paying $250 million to buy the NHL franchise. • Sharks: Forward Raffi Torres has undergone surgery to repair a torn ACL in his right knee. Torres had the operation Thursday and general manager Doug Wilson says he is expected back later this season. • Rangers: Derek Stepan is back in the fold in New York, agreeing to a two-year contract that should have him back on the ice in time for the season opener. • Maple Leafs: Toronto resolved its contract dispute with Cody Franson, agreeing to terms on a one-year deal with the defenseman. Franson, 26, had four goals and 25 assists during a career year in 2013. He is expected to play top-four minutes this season.