The Stars and Stripes are out of the World Cup.
Bradley identified Black Stars' striker Asamoah Gyan as the difference between the two sides.
"Gyan caused us trouble and got the winner," Bradley told Eurosport after the match. "Physically he is a real handful and at the end of the day, that's the area that took care of things.
"At the moment, it is a stinging, tough defeat."
"We knew that Ghana was a good team yet tonight, we didn't get the job done." he concluded.
Ghana advance to the quarter-finals, where they will take on Uruguay.
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