Javier "Javi" Martínez Aginaga is a Spanish professional footballer who plays as a defensive midfielder or central defender for Qatar Stars League club Qatar SC.
Martínez with Bayern Munich in 2019
Martínez (right) in action for Athletic Bilbao in 2010
Martínez playing for Bayern in November 2013
Martínez (furthest right) with Iker Casillas and Juan Mata after winning the 2010 FIFA World Cup
Defender (association football)
In the sport of association football, a defender is an outfield player whose primary role is to stop attacks during the game and prevent the opposition from scoring.
England women's captain Leah Williamson (left) defends for Arsenal.
Centre-back John Terry (right) closely marks centre-forward Didier Drogba.
Edwin van der Sar, pictured playing for Manchester United during the 2010–11 season, is considered to be one of the pioneers of the sweeper-keeper role.
Paolo Maldini marking a player during a friendly match.