NATAL, Brazil -- Rock-solid defenders who constantly chase, tackle and bully their opponents have been the key to Greece tactics ever since they became European champions in 2004. A decade ago, that team conceded a miserly four goals at Euro 2004 and its successor only conceded four in qualifying to secure its place at the 2014 World Cup as Greece stayed true to its reputation for hard work and ruthless discipline at the back. That all changed when the squad arrived in Brazil. The teams much-vaunted defence was torn apart in a 3-0 defeat by Colombia, whose display of speed and style sometimes left the Greeks standing around like statues. Greece now faces Japan in Natal on Thursday in a game that could very well put either team out of contention. Japan lost to Ivory Coast 2-1 in its opener, meaning neither team can really afford another defeat if they hope to advance out of Group C. Japan advanced to the round of 16 four years ago but lost to Paraguay on penalties. Greece has bowed out in the group stage in its previous two World Cups. For Greece, the need to rebuild its solid back line will be all the more important at a World Cup that is so far seeing crowd-pleasing flair in attack and plenty of goals: 44 in the first 14 games. Colombia scored in the fifth minute, forcing Greece out of its comfort zone right from the start and attacking with speed on the flanks. Greek frustration was reflected in two of its players drawing yellow cards in the second half. "That wasnt what people expected," Greece forward Andreas Samaris said. "I know what everyone expected of Greece though: that we would have 11 men behind the ball, defend, defend, defend and give everything to keep a clean sheet. "We went out to win against Colombia, and that philosophy will not change. We just hope it brings a better result for us because Japan is now a must, must-win game for us." Like Colombia, Japan is likely to attack at speed through the Europe-based trio of Shinji Kagawa, Yuto Nagatomo and Keisuke Honda. Against Ivory Coast, Japan had the better of the first half but ultimately struggled as the game got more physical in the second half. The arrival of the Ivorians star striker Didier Drogba as a second-half substitute also raised his teams performance and there was only a muted response from the Japanese. AC Milan midfielder Honda said that the team was determined to bounce back against Greece. "Nobody feels good about losing and obviously it was a shock," Honda, who opened the scoring with a powerful first-half strike, was quoted as saying. "But its not a shock that we lost, the thing that shocks me is we lost because we could not play to our strengths. "We gave our opponents front line too much respect. Mentally we were weak but that is not a problem that cant be fixed. 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All of 46 seconds into the Pittsburgh Penguins 3-2 victory over Alex Ovechkins struggling Washington Capitals, Crosby assisted on Chris Kunitzs goal.FRANKFURT - Vitali Klitschko is leaving boxing to concentrate on Ukrainian politics and his role as an opposition leader, and that should give Canadian Bermane Stiverne a shot at becoming a world heavyweight champion. Klitschko vacated his WBC heavyweight title on Monday and said he doesnt expect to fight again as he pursues a presidential bid in his home country, where citizens have been protesting for weeks in Kyiv over President Viktor Yanukovychs decision to shun closer ties with the European Union and push his country toward Russia. The World Boxing Council proclaimed Klitschko a "Champion Emeritus," a move that would allow him to challenge the new champion directly should he wish to resume his career. "This offer makes it theoretically possible to return to the ring, which I cannot imagine at all happening as things stand now," Klitschko said in a statement. "I am now concentrating on the politics in Ukraine, I feel people need me there." Stiverne (23-1-1), a Haitian-born Montrealer based in Las Vegas, is the WBCs top-ranked contender and has been waiting for Klitschko to make a decision on his future. It is expected that Stiverne will face No. 2-ranked American Chris Arreola for the title. On April 27, Stiverne scored a convincing unanimous decision over Arreola in Ontario, Calif. to win the WBC Silver belt, an unofficial interim title. Stivernes Montreal-based manager Camille Estaphan hopes to meet with WBC officials Tuesday in Los Angeles to confirm a title bout between his fighter and Arreola, which he hopes will take place in March or April. Estaphan said Klitschkos retirement may also help Stiverne financially. "If we had fought Klitschko, the champion would get 70 per cent of the purse, while now, that will be in our favour," said Estaphan. "Were hoping theres a little present under the tree for us just before Christmas.dddddddddddd" Klitschko is a lawmaker and chairman of the opposition party Udar (Punch) and intends to run for president in 2015. Klitschko has taken an active part in the rallies, urging his countrymen to continue their fight to turn the ex-Soviet republic into a genuine Western democracy. "This is not a revolution. It is a peaceful protest that demands justice," Klitschko told The Associated Press in an interview earlier this month. "The people are not defending political interests. They are defending the idea of living in a civilized country." The 42-year-old Klitschko has a 45-2 record, with 41 KOs. His younger brother Wladimir holds the other significant heavyweight belts. "My brother Wladimir will be responsible for further sporting successes," the older Klitschko said Monday. Vitali has not fought since September 2012, when he made the 10th defence of his belt with a fourth-round stoppage of previously unbeaten Manuel Charr. "With the current extreme and delicate political situation in Ukraine, Vitali has answered his countrys call to fight for human rights and equality. Accordingly, Vitali will not be able to provide the WBC with a predictable time-frame to return to the ring," the WBC said. "In other words, under his new distinction (Champion Emeritus), Klitschko will, in essence, retire with the option of being able to return to the ring at any time and be eligible to fight for the title against the reigning belt holder." The WBC said it will soon determine the top two fighters to participate in an eliminator bout that will yield the successor to Klitschkos vacant title. ___ With files from Canadian Press reporter Marc Tougas in Montreal and AP writer Maria Danilova in Kyiv. ' ' '