Question: What Brazilian professional footballer endorsed the Mercurial Vapor boot?
Related documents: [0]  [DOC] Philippe Coutinho Correia (] ; born 12 June 1992) is a Brazilian professional footballer who plays as an attacking midfielder for Premier League club Liverpool and the Brazil national team. [END] 
[1]  [DOC] The Mercurial Vapor is a football boot manufactured by Nike. The boot is known for being lightweight. Because of this, the boot is endorsed by many players for whom speed is part of their game, notably wingers or strikers, such as Cristiano Ronaldo, Franck Ribéry, Luiz Adriano, Zlatan Ibrahimović, Didier Drogba, Jesús Navas, Luka Modrić, Arturo Vidal, Douglas Costa, Xherdan Shaqiri, Raheem Sterling, Stephan El Shaarawy, Eden Hazard, Alexis Sánchez, Carlos Bacca and Philippe Coutinho, among others. [END] 
Answer: 
Philippe Coutinho Correia
Philippe Coutinho Correia