And the 19-year-old wasn't done, adding another score in the 65th minute to complete her first two-goal game.
That one also came after a poor clearance by Petersen, with Pugh stealing a pass on the right flank and taking it back into the center of the penalty area before pulling up and drilling a left-footed shot into the net for her eighth international goal in 30 games -- four of them in San Diego.
"I've had good luck here," Pugh said. "It's just a great atmosphere."
Between Pugh and Davidson, teenagers were responsible for two of the U.S. scores and both assists. And that leaves Ellis with a deep roster heading into World Cup qualifying this fall.
"It's the plan," said Ellis, whose team will play three more top-six teams in Germany, France and England in the four-nation SheBelieves Cup in March. "Last year was all about finding players. You can't just suddenly do this in two weeks and put new players out there. It was an important part in terms of our development.
"Last year, sometimes you take knocks in terms of that growth period. But it will pay off in 2019."
The final score came in the 81st minute when Crystal Dunn knocked home the rebound of a Christen Press shot.
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