US striker Jozy Altidore was stretchered off the field in Natal after injuring his hamstring in the 21st minute of the game against Ghana.
With Altidore injured, USMNT striker Aron Johannsson entered the field of play in the 23rd minute to replace him.
The injury to Altidore is ominous. Unfortunately, it could mean the end of the World Cup for the talented USMNT forward.
Watch a video of the incident here: