Despite the defeat, Martinez explained that the USA tour as a whole has been hugely useful to him as he moulds his side ahead of the Premier League kick-off in 10 days' time.
He told evertontv: "The weather was extreme, the humidity in Miami made it a difficult exercise.
"The first goal was going to be essential today, it allowed the other team to get the ball and keep it a bit easier and we got a bit frustrated towards the end."
He continued: "We played Real Madrid and Juventus and Valencia and it has been an important workout and it has been great for me to get a lot of information on partnerships and individuals in view of the start of the season. From that point of view it has been real success."
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