Question: 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?

Context paragraphs:
Basketball in Australia: Basketball is a sport played both indoors and outdoors in Australia.  Basketball is the number two sport globally with 213 countries participating in basketball internationally and with over 450 million players regularly playing the game.  According to research conducted by Sweeney Sports, one in three Australians have an interest in basketball.  Furthermore, basketball is played by approximately one million men and women, boys and girls throughout Australia.  According to Basketball Australia, as of March 2014, basketball is the second highest team participation sport in Australia.

Association football: Association football, more commonly known as football or soccer, is a team sport played between two teams of eleven players with a spherical ball.  It is played by 250 million players in over 200 countries and dependencies, making it the world's most popular sport.  The game is played on a rectangular field with a goal at each end.  The object of the game is to score by getting the ball into the opposing goal.

Injuries in netball: Netball is a sport that has one of the largest female participation rates within the commonwealth, most popular in the United Kingdom, Australia and New Zealand, with more than 20 million athletes participating in the sport.  Netball is a ball sport played by two teams of seven players in which goals are scored by shooting the ball through a netted ring.  Netball relies heavily on muscular endurance and bursts of rapid acceleration to “break free” from an opponent as well as, sudden and rapid change of directions in combination with jumping to receive a pass, intercept a ball or rebound.  The sudden stop-start motion of the game is what often leads to serious injuries in participants.  Higher grade players, in both senior and junior competitions, are more susceptible to injuries than lower grade players, due to the high intensity and rapid pace of the game.  An injury is most commonly defined as one that has occurred while participating in sport and which led to one of the following consequences: a reduction in the amount or level of sports activity; need for medical advice or treatment; and/or adverse economic or social effects for the athlete.

Professionalism in association football: Association football is the world's most popular sport, and is worth US$600 billion worldwide.  By the end of the 20th century it was played by over 250 million players in over 200 countries.  Around the world, the sport is played at a professional level by professional footballers, and millions of people regularly go to football stadiums to follow their favourite football teams, while billions more watch the sport on television or on the internet.  Football has the highest global television audience in sport.  The sport had amateur origins and evolved into the modern professional competition.

Roller in-line hockey: Roller hockey is a team sport played on a wood, asphalt, cement or sport tile surface, in which players use a hockey stick to shoot a hard plastic hockey puck into their opponent's goal to score points.  It is considered a contact sport but body checking is prohibited.  However, there are exceptions to that with the NRHL which involves fighting.  Inline hockey teams are composed of up to four lines of players including two forwards and two defensemen on each line.  There are five players including the goalie from each team on the rink at a time.  It is the goalie's job to prevent the other team's players from scoring.  Teams normally consist of 16 players that sit on the bench until it is their turn to play.  As the name suggests it is played on inline skates.

Football in Equatorial Guinea: Association football (soccer) is the most popular sport in Equatorial Guinea.  It was during the Spanish colonialism that football arrived to Equatorial Guinea.  Football is now a very popular sport in the country.  Recently the national team has made a few surprising results.  In the qualification for the FIFA World Cup in 2006 Togo (who later qualified for the World Cup) was beaten 1-0, and in the qualification for the African Cup of Nations they beat Cameroon 1-0.

Sport in Chile: Sports in Chile are performed at both amateur and professional levels, practiced both at home and abroad to develop and improve, or simply represent the country.  Football is the most popular sport in Chile, and is played for a range of reasons.  However, the country's most successful sport is tennis.  In rural areas, Chilean rodeo is the most practiced sport in Chile, which is the national sport, and is considered to be the second most popular sport, after football .  Chile has achieved great international success in other sports, and there have been important figures, however, such exploits are not known to the general population because they are not sports that have been popular throughout the country.

Sport in India: India is home to a diverse population playing many different sports across the country.  Football is a popular sport in some of the Indian states.  India have won all the Kabaddi World Cups to date.  Football is a popular sport in some of the Indian states.  The country has won eight Olympic gold medals in field hockey.  Cricket is although most famous sport in India.  Kabaddi, an indigenous sport is popular in rural India.  Several games originated in India including chess, snooker and other regional games.  India has won medals in badminton, kabaddi, hockey and many other sports and disciplines.

Sergio Pérez Leyva: Sergio Pérez Leyva (born 15 May 1993) is a Spanish footballer who plays for CD Mirandés as a goalkeeper.

Netball in Scotland: Netball in Scotland is a popular sport played mainly by women.

Supporting paragraphs: Sergio Pérez Leyva Association football
Answer: goalkeeper