A win at the FedEx St. Jude Classic ensured Dustin Johnson regained his world-number-one status after a four-week fall behind Justin Thomas.

It was comfortable in the end of DJ who fired a routine final-round of 66 at TPC Southwind to finish six shots clear of Andrew Putnam and jump back to the golfing world’s summit.

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You have to go back to February last year to find when Johnson took the top spot in the world and he had a 64-week stay there before Thomas snatched it following THE PLAYERS Championship last month.

Johnson started the year with a win at the Sentry Tournament of Champions and gathered eight top 20s and five top 10s in the following nine starts but, with Thomas’ Honda Classic win and tied 11th at THE PLAYERS, it was not enough to keep his hold at the summit.

However, Thomas’ position had never been secure and both Johnson and Justin Rose have threatened to take it in recent weeks.

And this week DJ grabbed his number-one spot back by the scruff of the neck.

A Friday 63 put Johnson in a commanding position and after a Saturday 65 he held a tie for the lead with Putnam at 15-under-par knowing that converting it would see him back to world-number-one.

Sunday at TPC Southwind could not have started much better for Johnson. Putnam opened with a double-bogey and after a birdie of his own on the third he was thrust into a three-shot advantage.

A bogey on the fifth cancelled his birdie out but Johnson concluded the front-nine in regimented fashion and made the turn two ahead of Putnam and six ahead of the rest of the chasing pack.

A wedge to three-feet on the 13th set up Johnson’s second birdie of the day and moved him to three shots ahead with just five holes left to play. It was Game and Set.

Two pars and then a birdie on the par-five 16th and it was Match, too. Johnson had a four-shot advantage with just two to play.

If there was any doubt left in the mind, Johnson cleared that up by holing out in incredible fashion for eagle on the 18th. That would push him to 19-under and six shots clear as winner at the top.

The week in Memphis had brought Johnson’s 18th career title, his second stint as world-number-one and the perfect confidence boost ahead of next week’s US Open.