2012 Philadelphia Union season

Columns: No | Position | Player | Nation
17 | Forward | Josué Martínez | Costa Rica | 18 | Goalkeeper | Zac MacMath ( GA ) | United States | 20 | Midfielder | Jimmy McLaughlin ( HGP ) | United States | 21 | Midfielder | Michael Farfan | United States | 24 | Defender | Porfirio López | Costa Rica | 25 | Defender | Sheanon Williams | United States

Example questions:
What is the position played by the Sierra Leonean footballer who played for the 2012 Philadelphia Union and holds American citizenship ? | What is the position for the player from the 2012 Philadelphia Union who was born September 10 , 1985 in San Jose ? | What is the position played by the athlete whose surname is Stopani and who wears a number higher than 19 for the 2012 Philadelphia Union ? | What is the position played by the athlete whose surname is Stopani and who wears a number lower than 18 for the 2012 Philadelphia Union ?

Answers:
Midfielder | Defender | Midfielder | Midfielder