Francesco Molinari on Sunday became the first Italian in 71 years to win a PGA tour title when he won the Quicken Loans National.
The last Italian PGA win came in 1947 when Italo-American Toney Penna won the Atlanta Open.
Piedmont-born Molinari ended 21 below par after rounds of 67, 65, 65 and 62.
He finished eight strokes ahead of America's Ryan Armour who carded a 13-under par 267.
Tiger Woods came fourth with an 11-under par 269.
Molinari said "I'm delighted.
"I've got back to my best".
Woods said "it was a great victory, my compliments to Francesco".
The head of Italian sport, Italian Olympic Committee (CONI) chief Giovanni Malagò, said "Chicco Molinari was simply fantastic".
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