However, Swedish midfielder Ishizaki - who played a key role in the opening goal - believes Bruce Arena's men can be more efficient in the attacking third.
"I think we played really well until we came into the last third. We struggled a little bit there," said Ishizaki.
"We could have been a lot cleaner and been a lot better.
"I think it's a little bit of opening night (nerves)," he added.
"You could see there were some nerves, some mistakes we probably wouldn't make in the middle of the season. But I think we played fairly well."
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