USA coach Mike Krzyzewski insisted his side are taking nothing for granted despite being favourites to win the FIBA Basketball World Cup.
The defending champions barely raised a sweat as they earned a last-16 clash with Mexico, winning all five of their Group C matches in Spain.
USA's flawless record throughout the group stages also saw them score a combined total of 511 points, with 2006 champions and host nation Spain (440) next best.
However, Krzyzewski believes there is still plenty of room for improvement as the USA aim to equal Yugoslavia's record of five world titles.
"I think we are a good team but we still have to get better," Krzyzewski told reporters on Friday.
"One thing about winning the world championships or the Olympics, you have to earn it. It has nothing to do with who is the favourite or your press clippings or predictions.
"It has to do with performance. You take away that P word that has predictions and you put performance in there and that's what you concentrate on."
USA have been led by a new generation of players that includes Cleveland Cavaliers star Kyrie Irving.
Irving, 22, has featured in all five games thus far, averaging 9.8 points, 2.8 rebounds and 3.8 assists and the Australia-born guard said his team-mates are relishing the challenge of the knockout phase.
"I feel like we are definitely in a better place, better than when we first started off," said Irving, who will team up with LeBron James in Cleveland next season.
"That's the most important thing going into the round of 16, a lot of good teams, looking forward to the challenge. It's going to challenge us mentally and physically and I'm looking forward to it."