Lingmerth shot a final round three-under-69 to finish 18 holes at 15-under-273 while Rose, who led by three overnight, made a clutch par after hitting a spectator in the head on the 18th for a 72 to join him on top.
Rose, the 2013 U.S. Open champion was looking to become the seventh man to win the Memorial multiple times, having claimed the first of his seven PGA Tour titles here in 2010.
Lingmerth was searching for his inaugural PGA Tour win.
(Reporting by Ben Everill, editing by Gene Cherry)
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