"That was nothing less than these guys deserved," Matterson told reporters. "They have come together, they did not know each well at all and they went through some adversity.
"But we had a good trial win in France and we have had a great time together and I am so proud of these guys.
"To do that after such a short preparation, and to come from behind a couple of times, once because of a real tough decision on one of their tries, means I am over the moon."
Matterson only took charge of the USA earlier this month, following the resignation of Brian Smith.