Christian Pulisic suffered an injury scare in the USA's win against Paraguay.
He got a kick in the first half and was taken off at halftime.
What happened?
Pulisic was a constant menace in the first half, providing an assist and helping create Paraguay's own goal.
He received a knock in the back of his leg, specifically his left calf area.
Why it matters for Christian Pulisic
The US team's talisman is shouldering the weight of a nation's expectations as they try to make history.
Coach Mauricio Pochettino said Pulisic was substituted to avoid taking any risks.
What comes next?
The US will hope Pulisic is correct about his injury, with games ahead against Australia and Turkey.
Pulisic said he's staying positive and doesn't think it's anything serious.
Pulisic had similar injuries before and is taking precaution.
He's really hoping it's nothing and will be fine in the next few days.
The US team had a convincing win, and Pulisic described it as an incredible start.
But he knows there's a lot more to do, and the team will need him to be at his best.
Pulisic's injury scare came in a World Cup where all of the US team's games will be played on home soil.
The US team will be eager to have their star player back on the field as soon as possible.
Pulisic's assist and contribution to the own goal were key moments in the game.
He's a vital part of the US team, and his absence would be deeply felt.
The US team's next game is against Australia on Friday.
Pulisic will be hoping to be back in action and helping his team to another win.