A five-shot victory at the Genesis Open gives Dustin Johnson the world-number-one spot for the first time in his career.

With five wins and 30 top 10 finishes in his last 50 ranked starts, the 32-year-old becomes the 20th holder of the world-number-one title, since the ranking’s inception, to solidify his spot as one of the game’s greatest.

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In the process, Johnson dislodges Jason Day, who needed a tied third or better finish if Johnson won to retain his spot, from the summit position and knocks Rory McIlroy down to third.

There’s further action near the top as Alex Noren returns to the top 10 after a brief absence, removing Patrick Reed, despite missing the cut at the ISPS Handa World Super 6 Perth on the European Tour.

Winner of that event, Brett Rumford, climbs from 274th to 133rd after beating Phachara Khongwatmai in the final, who jumps 57 places to 149th himself. Louis Oosthuizen came in fifth in Australia but remains 25th in the rankings.

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Back on the PGA Tour, Scott Brown, 231st to 114th, and Thomas Pieters, 47th to 33rd, finished in tied second behind Johnson at Riviera Country Club, the latter therefore ensures his place in the top 50 to qualify for the first World Golf Championship event of the year in two weeks time.

Wesley Bryan cracks the top 100 up to 96th from 141st with a tied fourth finish alongside Justin Rose, who remains 12th. Charley Hoffman and Kevin Na also finished tied fourth and earn rises of 11 places to 63rd and seven places to 44th respectively.

With just one event week left before the WGC-Mexico Championship, this week offers the final opportunity for those hanging just outside the top 50, including Martin Kaymer and Andy Sullivan, to push for a position amongst it to earn automatic qualification in Mexico.

The full, updated, rankings can be found here.