Pettersson, who earned $1,026,000 for the win, became a U.S. citizen in January, joining his wife and children, all born in America, as U.S. citizens.
"Only test I ever made a hundred," he joked.
He knows that Swedish golf fans also will be excited about his latest win. "But I've lived here so long," Pettersson said, "I'm very American."
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