What position did Sergio Perez Leyva, a Spanish player, play that is the world's most popular sport played by 250 million players in over 200 countries?
Sergio Pérez Leyva: Sergio Pérez Leyva (born 15 May 1993) is a Spanish footballer who plays for CD Mirandés as a goalkeeper. Association football:  It is played by 250 million players in over 200 countries and dependencies, making it the world's most popular sport.
goalkeeper