Dustin Johnson shot a final-round 66 to hold off John Merrick by a stroke in the St. Jude Classic in Memphis, Tenn. Johnson finished 72 holes at 9-under 271. (Associated Press)

Dustin Johnson shot a final-round 66 to hold off John Merrick by a stroke in the St. Jude Classic in Memphis, Tenn. Johnson finished 72 holes at 9-under 271. (Associated Press)