Dustin Johnson’s raw talent and a trophy case that keeps growing allowed him to believe he was the best player in golf.
Now he can say it.
Even if he doesn’t understand the math involved with being No. 1.
Johnson extended a remarkable run, which began with his first major at the US Open last summer, with a five-shot victory in the Genesis Open that was never in doubt Sunday in Los Angeles. That elevated the 32-year-old American to No. 1 in the world for the first time.
Johnson doesn’t spend a lot of time crunching numbers, especially the computations for the world ranking. But he said he would look at it first thing in the morning.
‘‘I don’t really understand it,’’ he said. ‘‘But I can read 1-2-3. I guess that’s all that matters.’’
In a 36-hole Sunday brought on by weather delays at Riviera, all it took was five holes to put Johnson in charge. He finished the third round in the morning with three straight birdies for a 7-under-par 64 to build a five-shot lead. He started the final round with two straight birdies and eventually stretched his lead to nine shots.
He went 49 holes without a bogey.
Johnson, who made three meaningless bogeys over the last 10 holes for an even-par 71, became the 20th player to reach No. 1 since the world ranking began in 1986. He ended Jason Day’s 47-week stay at the top.
And it’s not a surprise to Johnson.
Asked if he ever looked at himself as the best in the world even without the No. 1 ranking, Johnson smiled and said, ‘‘All the time.’’
LPGA — Ha Na Jang had an eagle and three birdies over her last six holes in a superb finish that set up a three-shot victory in the Women’s Australian Open.
‘‘It’s a really good, strong finish. That is why it’s good sport today,’’ the South Korean said after closing with a 4-under 69 to finish at 10 under at Royal Adelaide.
No. 6-ranked Jang regained her composure after opening with a bogey in the last round and finished three shots ahead of Nanna Madsen, who finished with an even-par 73 for a 7-under total 285.
Haru Nomura, the 2016 champion, closed with a 73 to finish in a four-way tie for third place at 6 under with No. 2-ranked Ariya Jutanugarn and Australians Minjee Lee and Sarah Jane Smith.
Lizette Salas started Sunday with a two-stroke lead but struggled in the last round and closed with a 5-over 78 to fade into a share of seventh place at 5 under with six others, including fellow Americans Beth Allen, Marina Alex, and Canadian Maude-Aimee Leblanc in the LPGA event.
European — Brett Rumford beat Phachara Khongwatmai, 2 and 1, in the final round of match play to claim the first World Super 6 tournament title near where he grew up in West Australia.
The 39-year-old Rumford underwent surgery in 2015 to have a section of his small intestine removed after falling ill in South Africa and lost his European Tour card last year during a long winless stretch, but has earned back full status with his first win on the tour since 2013.
Rumford led by five strokes at 17-under 199 after 54 holes of stroke play in the experimental golf tournament at Lake Karrinyup Country Club in Western Australia, which is being sanctioned by the European, Asian, and Australasian tours.
Eliminations during three rounds of stroke play whittled the field down to 24 for five six-hole rounds of match play on Sunday. The top eight seeded players, led by Rumford, had a first-round bye.