That's where I noticed him too.
Man, that was one great championship and the boys who shone there are famous footballers nowdays. That 2007 u20 world cup in Canada was the place where I first saw Sanchez, Cavani, Pato, Vidal, Di Maria, Giovani dos Santos, Mata, Zarate, Isla, Luis Suarez, Chicharito, Vela, Pique, Banega, Coentrao, Marcelo and it was the first time where I could follow Aguero more closely (he came to Spain a year earlier but I didn't really follow him there).
The u20 in 2009 was a big disappointment compared to the 2007 one and only Andre Ayew from those boys in 2009 made a name for himself.