Two goals from Chicharito secured victory for the North Americans, despite Shinji Okazaki pulling a goal back late on, as the Samurai Blue recorded a third defeat in a row at the tournament.
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"We played fuzzily; even when we attacked, [Okazaki] was the only one giving his all and it feels like ... what on earth did we come here to do?" he told reporters. "It was a miserable performance.
"We didn't have anything left and lost in a very Japanese fashion. We tried hard but we lost."
The United man also lamented his side's ability to be more clinical in front of goal, which he feels is something on which Japan must improve.
"We had some good chances in our build-up and it felt like both teams were drifting a bit so, if we'd been able to score first ... we weren't able to score in those situations in all three matches, so it's a problem we have to consider," he added.
"At minimum, to beat a team like Brazil we have to improve individually and as a team, and today we saw again that if we don't fight as a team we can't win; in the second half it felt like Mexico wanted to win more."