Ghana's mistakes cost them in a 2-1 defeat to the USA in Group G, according to Black Stars coach Kwesi Appiah.
Though Ghana beat the Yanks in each of the past two World Cups, a USA goal in the 86th minute kept Ghana at bay on Monday night.
"What I can say is that it was a very tough game," Appiah said after the match, according to Sky Sports.
"Playing at this high level, any little mistake can cost you dearly."
USA's talisman striker, Clint Dempsey, was able to score within the first 30 seconds of the match.
Though Ghana held the advantage in possession, corners, shots and shots on goal, the Black Stars were unable to equalise until the 82nd minute.
"We didn't deserve the first goal against us, and as for the game itself, we did possess and create a lot of chances," Appiah added. Unfortunately we could not take our chances and the US took their chances."
"Any loss of concentration can cost the team big time. I believe the first goal unsettled us a little bit, but I never expected it to end this way."
Ghana will next play Germany on June 21 at 16:00. The Germans beat Portugal 4-0 in their opening Group G fixture earlier on Monday.
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