Fiji got their campaign for a record fourth straight title at the Hong Kong Sevens under way with a 31-12 victory over Samoa on Friday night.
The Islanders were led by the impressive Amenoni Nasilasila who added two conversions to a second-half try that came via a cross-field dash, bringing the Hong Kong Stadium to its feet.
Fiji are at full strength for the seventh leg of this year's World Rugby Sevens Series.
"They are the form team," said Cox. "They have come locked and loaded and fully stacked. They have a couple of Olympic gold medalists, the Commonwealth games next week, the World Cup on the horizon and they are going to hit all with their top talent."
Speaking after the opening day, Fiji coach Gareth Baber said: "I was pleased with what we delivered, about the pace and the power of our game. I thought we could have been a bit tidier at times when we didn't have the ball but it's the first game, and it's a win."
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