Delgado scored a goal at the 2002 FIFA World Cup, the first goal for the Ecuadorian team in a World Cup, against Mexico. Delgado was also joint top scorer (with Hernán Crespo) in the CONMEBOL qualifiers for the tournament, with nine goals.

Delgado is known for being a strong player, equally apt in offense and defense. He is also known for his air prowess. Delgado is an excellent finisher with either foot and especially with his head, when he towers over the opposing defences. He has a superb sense of positioning in the box and has excellent field awareness.

All this has given Tin an iconic status in Ecuador, and he obtained a reputation as one of the most feared South American strikers.

He helped Ecuador qualify once again to the World Cup, contributing with 5 goals in 10 games and stated that Germany 06 would be his last.

In the 2006 FIFA World Cup, Delgado scored a goal in Ecuador`s opening match against Poland, in the 80th minute. In the following game, he scored a goal in 55th minute goal in their 3-0 victory over Costa Rica, enabling Ecuador to qualify alongside hosts Germany for the last 16.

The 2006 World Cup, a historic achievement for Ecuador, was the last international tournament for Delgado. Nevertheless, El Tin is looked on as one of Ecuador`s best football players of all time.