"We're really satisfied with the victory and how we played," said the midfielder, who has just signed for Arsenal from Borussia Dortmund.

He also said the match was not as easy as the result showed: " They were tough opponents and I am not sure that the score can indicate how tough they were."

Rosicky, who has been a constant thorn for the US defence, scored his first on the 36th minute with a 20-meter drive and seeing the ball swerved into the top corner, giving Kasey Keller no chance.

After the interval, he again coolly finished into the top corner with the outside of his right boot at the 76th minute after Pavel Nedved of Juventus made his way into the box and put Rosicky through on goal.

Jan Koller, Rosicky's teammate for both club and the national side, opened the scoring in just 5 minutes for the Czechs, who had made eight appearances in the World Cup Finals as the Czechoslovakia and played a successful qualifying campaign to return to the tournament after a 16-year absence.

The towering striker wasted no time after receiving a nice cross from Zdenek Grygera from the right wing and sent in a bulletheader to earn an earlier upper hand at 5.

His team, however, suffered a major blow at the break as Kollerrolled over in the 42nd minute with a challenge from Oguchi Onyewu, who had been booked in 4 minutes for a late challenge on Pavel Nedved, and was carried off on a stretcher while the challenge was not ruled as a foul.

Vratislav Lokvenc replaced the 33-year-old in the following minutes.

Czech coach Karel Bruckner now has to worry about the injury concerns of his team as Koller went off Monday's opener with a hamstring tear, Nedved was hurt too to halt the match for several minutes, and Milan Baros had been sidelined even before the match kicked off by a foot injury.

"Unfortunately his injury is very serious," said Brueckner. "It is the only shadow over today's otherwise perfect match."

"It's probably a thigh muscle," he added. "He was in good shape and this is really bad luck."

The US coach Bruce Arena was depressed to the complete defeat but declined to blame any of his players.

"I'm very disappointed...At the first half, I thought we played OK, but we were down two goals and had to chase the game. It's really tough," he said.

"Besides giving up on the first goal, second balls were the name of the game tonight," he added. "We made changes for tactical reasons."

Captain Claudio Reyna echoed, rating the first goal of the Czechs most important.

"The first goal changed everything, as both teams were under pressure," he said. "The Czechs are very confident players. Rosicky will certainly be one of the top players of the tournament."

"We have to get better quickly," he added.

Arena's side didn't fall panic-stricken right after the first let-in with Reyna hitting the post from distance at 27, but the second goal from the Czechs turned them heavy on their feet.

There were plenty of USA possession both before and after the break, but it's the Czech Republic who came dangerous in attacking on the break.

Bobby Convey turned his man with ease on the left for the US at 65, but then wasted the opportunity he had created for himself with a wayward pass, and Eddie Johnson, the best player of the US in the second half, went close with a looping effort from the edge of the box at 79 that flew over the bar.

Next the United States take Italy on Saturday, before playing their last group rivals Ghana on 22.

"The team will respond well on Saturday. It's a challenge to get better performance out of individuals," said Arena.