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| Cristiano Ronaldo and Lionel Messi |
Debates about who is world's best player will rage when Lionel Messi faces Cristiano Ronaldo as Argentina play Portugal at Old Trafford on Tuesday, but for Argentina coach Gerardo Martino there is only ever one choice.
Barcelona's Messi and Real Madrid's Ronaldo continually go head-to-head to top the scoring charts in La Liga and the Champions League, and FIFA's Player of the Year award has become a two-horse race between the pair in recent years.