Kazakhstan says five of its athletes have failed retests from the 2008 and 2012 Olympic Games. The athletes were not named and it was not immediately clear in which events they competed.The Central Asian nation has faced repeated doping scandals in recent years, particularly in weightlifting and cycling.The IOC is retesting samples from the Beijing and London Olympics to catch cheats who might be competing this year in Rio de Janeiro. So far, 55 positives have been recorded - 32 from Beijing and 23 from London.Separately, the Russian Olympic Committee says two of its athletes B samples came back negative.They are race walker Denis Nizhegorodov and rower Alexander Kornilov. Athletes must provide 90ml of urine or a blood sample. If there are adverse analytical findings in the B sample as well as the A the athlete will be banned for violating anti-doping regulation.B samples are not more important than A samples, but they confirm findings in the first analysis. If the analysis of the B sample does not confirm the findings in the A sample, the athlete is cleared to compete.WADA Director General David Howman said: The B sample helps confirm that an anti-doping rule violation has occurred and protects the rights of the athletes.It should be stressed that anti-doping is one of the few types of controls in society in which a confirmation procedure is used in order to protect individuals, and the very rare cases in which the analysis of the B-sample did not match the results of the A-sample have shown the usefulness of such procedure. Also See: 23 fail London 2012 retests Coe: 2012 not dirtiest Games Eight Russians fail retests Russia seeks Rio compromise Dante Exum Jersey . Yoenis Cespedes proved he can play through a hurting right heel, giving Scott Kazmir and the As a spark with a pair of RBIs that helped spoil the Minnesota Twins home opener with an 8-3 victory on Monday. Tony Bradley Jersey . So much so that even a simple foul pop up to the first baseman turned into a run. Houstons four-run rally in the ninth inning to beat the Seattle Mariners 6-4 on Monday night was capped by a bizarre play that started as Crowe fouled out to first baseman Justin Smoak with runners on second and third. http://www.jazzauthentic.com/kids-jae-crowder-jazz-jersey/ .com) - Longtime Senators star Daniel Alfredsson returned to Ottawa on Thursday to officially announce his retirement. Adrian Dantley Jersey . Louis Cardinals pitcher Jaime Garcia will have surgery on his left shoulder this week and is expected to miss the rest of the season. John Stockton Jersey . Five years ago, Nestor and Zimonjic beat the American twins to win the title. But the Bryans, the worlds top-ranked team, needed 74 minutes to earn the victory Saturday as both Nestor and Zimonjic lost serve in the second set.ST. CATHARINES, Ont. - Curtis Lazar is leaving the Ottawa Senators to play for Canada at the world junior championship, a decision those involved consider a win-win.The 19-year-old Lazar gets the experience of playing against the best junior players in the world, Canada gets a polished top-six forward and the Senators hope to benefit down the road from the development their top prospect gets from his second of these tournaments.Hes going to play a more prominent role, Senators coach Dave Cameron said. With us hes in the bottom six, playing a safe role. There hes going to be a go-to guy. Thats a real world-class tournament on a huge stage, so all those factors are going to make him a better player.Lazar was Ottawas fourth-line centre averaging 12:45 a game, second-lowest on the team ahead of only Chris Neil. Wednesday night at the New Jersey Devils, Lazar skated 15 shifts for 8:30, his lowest totals of his rookie season.Hockey Canada had discussions with the Senators this week about getting Lazar, but the organization didnt find out until Thursday morning that hed be joining the world junior team. Understandably, those in charge of the team are thrilled to add Lazar to a group already favoured to win gold on home ice.He is a big piece of the puzzle, said Scott Salmond, Hockey Canadas vice-president of hockey operations. He will come in here, hopefully with a lot of confidence and a lot of experience of having been here last year. We expect him to be a leader, and we expect he is going to give our group a boost.Lazar called it bittersweet leaving the Senators in the middle of the season, especially considering the upheaval lately with the firing of Paul MacLean and the hiring of Cameron as coach. But he relishes the idea of becoming that go-to-guy at the world juniors.The Ottawa Senators, Im happy to be here, I love to be here and I feel Im going to have a long, healthy career here with them, said Lazar, who has a goal and six assists this season. Two weeks its not going to make that much of a difference.Having Lazar could make a huge difference for Canada, which already had six returning players: goaltender Zach Fucale, defenceman Josh Morrissey and forwards Sam Reinhart, Connor McDavid, Nic Petan and Frederik Gauthier. Lazar could slide in on Canadas second line on one of McDavids wings, something he said would be a lot of fun.Salmond said it was up to coach Benoit Groulx whether Lazar would play wing, as he did in 2014, or line up at centre.I see him, imagine him, playing a lot, Salmond said.Thats part of the reason Cameron, who has a history of coaching with Hockey Canada, supported letting Lazar go. Ultimately, the decision rested with Senators general manager Bryan Murray, but he got input from Lazar and Cameron along the way.Lazars teammates saw last year what he can bring to a tournament like this when he was a point-a-game performer.Curtis brings everything, really, Morrissey said. He is an all-around player, he brings a lot to our team on the ice with his skills and ability, but off the ice he brings tremendous leadership. He is a hard-working, honest guy.Before he even skates with this group, Lazarr becomes a top candidate along with Reinhart to be named captain.dddddddddddd At the very least, the Salmon Arm, B.C., native will be part of Canadas leadership group because hes constantly smiling and can lighten the mood.He always brings down the pressure, McDavid said. Hes obviously going to be a huge leader, if not the biggest leader on this team.Groulx, an assistant last year in Malmo, Sweden, has only good things to say about Lazar on and off the ice.Hes well-liked by his teammates, respected by his teammates, Groulx said. Hes won everywhere. Hes a competitor, everybody acknowledges that. Hes such a great young man. I think hell fit right in with our guys.The downside of Lazars addition will be felt by the one extra player who has spent the week at Canadas camp at Meridian Centre in St. Catharines but wont be starting the tournament with the rest of the group Dec. 26 in Montreal. Now three forwards will need to get cut, along with a defenceman, to get down to the 22-man roster.Thats part of the process, Groulx said. Having Curtis back, obviously I think it puts a smile on everybodys face on this team. Yeah, its going to make our decision tougher, but I think its good for our team to have him back.Five forwards appear to be on the bubble of making the team: Gauthier, Michael Dal Colle, Jason Dickinson, Rourke Chartier and 17-year-old Lawson Crouse. Though Gauthier is a returning player, the Toronto Maple Leafs prospect doesnt consider his spot safe.I think I need to earn it, Gauthier said. I dont think I got it right now.Dickinson, who centred the fifth line this week, understands he has to show his value Friday night in Canadas exhibition game against Russia at Air Canada Centre in Toronto. He isnt worried about the Lazar news affecting him mentally.It is one of those things that happens in hockey, Dickinson said. There are going to be guys out there and take your spot, and you just have to battle through it.Theres little doubt that Canada is a better team with Lazar than without. Hes the second full-time NHL player to join after the New York Rangers released Anthony Duclair to play.It obviously makes us a lot deeper, McDavid said of adding Lazar. Theres so many good players throughout this country at this age. Obviously hes one of the best. Hes going to help all around.Lazar will meet up with the team in Toronto but wont play in Fridays exhibition game. Hes hoping to put on a show for the Sens fans Sunday when Canada plays Sweden in an exhibition game at Canadian Tire Centre.Obviously the long-term goal is the games that matter and Lazar trying to help Canada win its first world junior gold medal since 2009.Were on home soil here and the expectation is for us to win gold, Lazar said. My junior resume, its pretty complete except for a medal at the world juniors. Its a big opportunity here and I like the team that they have in place so far and Im going to go and contribute and hopefully I can check that one off the list.With files from Lisa Wallace in Ottawa---Follow @SWhyno on TwitterNote to readers: This is a corrected story. A previous version said there were six returning players. 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