Uefa Cup

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Benfica's Rodrigo, left, scores a goal past Tottenham's Kyle Naughton, right, during the Europa League round of 16 first leg soccer match between Tottenham Hotspur and SL Benfica at White Hart Lane stadium in London Thursday, March 13, 2014. (AP Photo/Kirsty Wigglesworth)

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Napoli's Gonzalo Higuain, from Argentina, reacts after missing a shot against FC Porto during their Europa League round of 16, first leg soccer match at the Dragao stadium, in Porto, Portugal, Thursday March 13, 2014. (AP Photo/Paulo Duarte)

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FC Porto's Jackson Martinez is mobbed by teammates as they celebrate after scoring the opening goal against Napoli during their Europa League round of 16, first leg soccer match at the Dragao stadium, in Porto, Portugal, Thursday March 13, 2014. (AP Photo/Paulo Duarte)

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Valencia players celebrate after scoring their first goal against Ludogorets during their Europa League round of 16 first leg soccer match at Vassil Levski stadium in Sofia, Thursday, March 13, 2014. (AP Photo/Valentina Petrova)

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Valencia's Antonio Barragan celebrates after scoring against Ludogorets during their Europa League round of 16 first leg soccer match at Vassil Levski stadium in Sofia, Thursday, March 13, 2014. (AP Photo/Valentina Petrova)