United States key man Michael Bradley says his team will be going into their World Cup opener against Ghana full of confidence despite the fact that the African's thrashed South Korea 4-0 Monday night.

Bradley and his US teammates watched Ghana impressively dismantle the Koreans at Miami's Sun Life Stadium alongside their head coach Jurgen Klinsmann, with the US team in full scouting mission mode.

What they found was a Ghanian team prepped and ready for the World Cup, oozing strength and skill in an ominous performance.

However, Bradley remains confident in his team's capabilities, but he remains cautious and says his team should be wary of a 'dangerous' Ghana team who they face in their World Cup opener Monday June 16, 6pm ET.

"It would be easy to look at the end and say '4-0 what a performance,'" Bradley told Yahoo Sports. "But still, it's a warm-up game.

"Regardless of how the game went, we have a lot of respect for Ghana. We know that they're dangerous. But I'm not sure how you can take from last night or any of these games, to be honest."

Bradley knows that the first game for the US could be everything with a quick start needed. European powerhouses Germany and Portugal follow for the US after Ghana, and the midfielder is well aware of how important the opener is.

"The first game is so important," Bradley added. "So we certainly made no secret that all the focus at this point is about Ghana and making sure we do everything we can spot.

"We can sit here now and talk about wanting to start well. But just because you talk about it doesn't mean it is guaranteed."

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