Jersey coach Neil MacRae says the emotion of their opening victory in the World Twenty20 Qualifier cost them the chance to win their second game.
"It was a brilliant performance," MacRae told BBC Radio Jersey.
"But it took a lot out of us both physically and emotionally and we didn't quite have the same level."
Jersey are making their debut in the global qualifiers, having won European Division One in May.
The tournament, which will send six non-Test playing nations to next year's ICC World Twenty20 in India, represents the highest level a team from the island has ever reached in an international competition outside of the Commonwealth Games.
But MacRae says that his side have experienced losing the second match in a tournament before, so know how to cope with it.
"In European Division One after the Italy game we had a similar situation against Denmark and we're still really confident about the start we've made and we're looking forward to the USA game (on Wednesday)," he said.
"We need to understand that this was a two-game start to the tournament and we've had a brilliant start, today didn't go for us, yesterday was fantastic," added MacRae after Sunday's defeat.