SOCHI, Russia -- A Ukrainian cross-country skier has failed a doping test, her countrys Olympic committee said Saturday. It is the third positive result of the Sochi Games. Marina Lisogor tested positive for trimetazidine, which is classified as a "specified stimulant" on the World Anti-Doping Agencys prohibited list. Specified substances are considered more susceptible to inadvertent use and can carry reduced penalties. The 30-year-old Lisogor competed in two cross-country events in Sochi, finishing far out of the medals. According to the Ukrainian Olympic Committee, Lisogor said she did not knowingly take a banned substance. Lisogors failed drug test follows those of German biathlete Evi Sachenbacher-Stehle and Italian bobsledder William Frullani. All three drug-test failures are tied to stimulants. The IOC is conducting 2,453 drug tests in Sochi, a record for the Winter Games. The Olympic body also stores Olympic doping samples for 10 years to allow for retesting when new methods become available. Sachenbacher-Stehle, a former two-time Olympic gold medallist , tested positive for methylhexanamine in both samples. The German Olympic Committee said she was being sent home. She blamed a nutritional supplement and said she had never knowingly taken performance-enhancing drugs. "I am going through the worst nightmare that you can imagine because I am unable to explain at all how there could be a positive test," she said Friday. Frullani was ejected from the games after testing positive for dimetylpentylamine. Frullani, who had not competed yet, asked for a backup test that confirmed the result. The Italian Olympic Committee told The Associated Press it believed Frullani, a former decathlete, bought the stimulant on the Internet from the United States since it is not available in Italy. 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Smith scored two goals, and Tuukka Rask made 33 saves for his fourth shutout of the season to lift the Boston Bruins to a 5-0 rout of the Ottawa Senators on Friday night. "Hes a very talented player and he gets in front of the net. Its paying off for him right now," Bruins forward Brad Marchand said. When the Bruins traded Tyler Seguin in the off-season, they received Loui Eriksson, Smith, and two other prospects. Eriksson was the marquee player in the deal, but Smith has yielded the real return thus far. Eriksson has missed time because of two concussions. "I dont think he was looked upon as a throw-in," Bruins coach Claude Julien said. "It is the first time he has been given the opportunity to play on a regular basis, and he is finally showcasing his skills. Its no fluke." Smith scored twice in the third period, giving him a team-leading 14 goals. He has five goals and two assists in the last three games. "Hes really taken that opportunity that hes been given, and is on a streak right now," Rask said. "When youre hot, youre hot, just keep shooting." Erikssons injuries opened the door for Smith to move from the third line to the second line, alongside Patrice Bergeron and Marchand, and find his groove. Smith also has 16 assists and is second on the team in points. The Bruins are 13-0-2 in their last 15 home games and have won eight straight in Boston. They havent lost there in regulation since Oct. 26. Rask (20-8-2) has allowed one goal or fewer in 15 of his 30 starts this season. After earning only 19 wins last season, he is now the third goalie with 20 NHL wins this season. Boston tied a club record, set in 1929, by having a player score two goals for the seventh straight game.dddddddddddd Smith has done it three times. Robin Lehner made 36 saves for Ottawa, which has dropped four of five. "We were really bad. End of story," Lehner said. "Twenty good minutes and 40 bad ones. Teams are picking us apart when we arent working hard and when we arent playing hard." Jarome Iginla beat Lehner with 3:31 remaining in the second when he slammed in a rebound of Torey Krugs slap shot during a power play to make it 1-0. Ottawa dominated the first period, holding a 15-5 shot advantage, but Boston turned the tables in the second with a 20-8 edge. In addition to the 19 saves in the second period, Lehner was stung by Johnny Boychuks slap shot, but stayed in the game. "We hung Robin out to dry," Senators captain Jason Spezza said. "One step forward and one step back. We need to start playing better hockey or they arent going to let us play much longer." David Krejci put Boston ahead 2-0 with a shot from the right circle 38 seconds into the third period. "In the third, getting that early goal by Krejci was a big momentum shift," Iginla said. Marchand capped the scoring with a short-handed goal with 27 seconds remaining. The teams will complete the home-and-home series on Saturday at Ottawa. NOTES: Bruins LW Daniel Paille returned after missing seven games because of a concussion. ... Ottawa is one of three teams that has never swept Boston in a season series. ... Boston D Dennis Seidenberg sustained a lower-body injury. He wont play on Saturday. ... Bergeron added two assists for Boston, which has outscored its last three opponents 15-3. ' ' '