Oscar scored a late winner less than a minute after coming on as a susbtitute as Chelsea snatched a 1-0 victory at Sparta Prague in the Europa League last 32 on Thursday.
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The Brazilian replaced Juan Mata in the 81st minute and was on target shortly afterwards to put the Champions League holders in command ahead of the home leg next week.
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Gareth Bale's double lifted Tottenham 2-1 past Olympique Lyon, but Newcastle were held 0-0 by Metalist Kharkiv and Liverpool went down 2-0 at Zenit St Petersburg.
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Russia enjoyed a perfect night as apart from Zenit's win visiting Rubin Kazan ambushed title holders Atletico Madrid 2-0 and Anzhi Makhachkala came from behind to beat Hanover 3-1.
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The biggest surprise was Victoria Plzen's 3-0 triumph at Italy's Napoli from Vladimir Darida in the 28th and late goals from Frantisek Rajtoral and Stanislav Tecl.
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Plzen did better than the fellow-Czechs from Prague who contained an average Chelsea for a long time and also had scoring chances before Oscar broke their resistance in the 82nd.
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"Mata was doing a great job but he was a bit tired in my opinion. I needed fresh legs and the quality of Oscar was very good because he made the difference," Chelsea manager Rafael Benitez said
liverpool keeps playing really well but at the same time, they keep losing.