After his latest win at the Genesis Open, Dustin Johnson became the world number one for the first time.
The five-shot victory extended his remarkable run, which began with him winning the 2016 US Open.
Dustin joins Arnold Palmer, Tiger Woods and Jack Nicklaus as the only golfers to win at least one tournament in each of their first 10 seasons on PGA tour.
Golf: Dustin Johnson career highlights
20th no.1 and a 6th American
Dustin Johnson is just the 20th golfer to hold the world No.1 position in golf rankings and he is only the sixth American to do so.
Dustin Johnson profile
Dustin Johnson was born on 22 June 1984, in Columbia, South Carolina.
He made his PGA (Professional Golfers Association) tour debut in 2007.
Towards the end of his rookie season, he won his first PGA tour event, the Turning Stone Resort Championship, in Oct 2008.
Dustin's best result to date is winning the 2016 US Open, the only majors he clinched.
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What are the golf majors?
The four major golf tournaments held every season, commonly known as the majors, are - Masters Tournament, US Open, The Open Championship or the British Open, and the PGA Championship.
Professional wins summary
Dustin Johnson has a total of 13 wins on the PGA tour, including the 2017 Genesis Open victory.
For the US national team, he was part of the winning teams of - the 2007 Palmer Cup and Walker Cup; 2010, 2012, 2016 Ryder Cup; and 2011, 2015 Presidents Cup.
2016 was his best season when he was voted PGA Tour Player of the Year.
Time and again Dustin Johnson has come under the cloud of drug usage.
After the 2012 failed test he was given a suspension which was never made public.
Again in 2014, he was forced into a 6-month "leave of absence".