Costa Rica scored a late goal to beat Japan and advance to the knockout rounds.
Japan were frustrated by a tight defensive unit after their shock win over Germany.
The result leaves both teams on three points, with Spain and Germany playing each other later in the day.
Spain will almost certainly progress to the last 16 if they win.
Many expected Japan to account for Costa Rica after they lost to Spain.
Japan boss Hajime Moriyasu decided to make five changes and that resulted in a subdued performance and a big win for the group.
It was a remarkable victory for Costa Rica, who had failed to lay a glove on the Japan defence before Fuller's shot from the edge of the box escaped Gonda's grasp.
The first half at Ahmad Bin Ali Stadium was devoid of goalmouth action. They struggled to create clear-cut chances until the 88th minute, when Daichi Kamada could not turn the ball home.
Japan were left to rue a disappointing display that failed to back up their heroics against Germany after Costa Rica achieved redemption following their humiliation at the hands of Spain.
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