Koepka staved off a brilliant charge by Englishman Fleetwood, who matched the lowest score in tournament history, a seven-under-par 63 at Shinnecock Hills.
Koepka shot a closing 68 to finish at one-over 281 and become the first to win back-to-back since Curtis Strange in 1988 and 1989.
(Reporting by Andrew Both; Editing by Ken Ferris)
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