Johnson shot 4-under par in the final round to secure his second win on the PGA Tour this year and the 18th of his career.
"I'm glad it's over, for sure", Johnson said.
"A lot of good things happened this week".
"I knew coming in this week that I was swinging really well and had a lot of confidence in my game".
Dustin Johnson is back as world No 1going into this week's US Open after reclaiming the mantle with an emphatic victory in Memphis on Sunday night.
The 33-year-old, knocked off the top of the rankings last month by fellow American Justin Thomas, mixed three birdies, a bogey and a stunning final-hole eagle to finish on 19 under par. Johnson said he couldn't tell if the ball went in for a few seconds.
"I'm driving it well, I'm really hitting my irons well, my wedges are really good, so I'm really looking forward to going into next week". Putnam never threatened DJ's lead, and Johnson essentially locked up the title with a 15-foot par putt at No. 12 and then a birdie at 13 to extend his lead to three strokes. "What a cool way to end the day, to hole that shot there on 18". "I felt like I handled myself better than my score looked". "It was a long way to get there, and I held it for a long time and obviously JT took it from me for a little while".
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