South Korea players have spoken of their delight after defeating Greece 2-0 in their opening World Cup game.

It was the Asian nation's second World Cup finals win outside of their home continent and has set them up to force their way into the second phase of the competition following Nigeria's loss to Argentina.

Goalscorer Lee Jung-Soo told FIFA.com that it was the speed of the Koreans that did the damage against a more physical but slower Greek opposition.

"It's still too early to say that the Korea of 2002 are back, but what's certain is that we were able to use our speed to maximum advantage," he said. "We expected the Greeks to be slow. We knew that even if they were bigger and more physical than us, we had to use our speed as our principal strength."

Defender Cha Du-Ri echoed Lee's sentiments, saying: "We were wary of their physical style because they're big and go hard into the tackle. But I was surprised by how slow they were; we didn't think our pace would cause them so many problems. It even made it possible for our midfielders and the full-backs like myself to offer more of a threat going forward."

South Korea take on group favourites Argentina in their second match on Tuesday in Johannesburg.