Australia’s Jason Day leapfrogged Rory McIlroy at the top of the world rankings with a six-shot victory at the BMW Championship title at Conway Farms near Chicago .
The 27-year-old secured his fourth win in six tournaments with a final round of 69 to finish on 22 under par, having shot 61, 63 and 69 in the opening rounds.
American Daniel Berger also closed with a two-under 69 to reach 16 under for the tournament and earn outright second place, with Scott Piercy making birdie at the last to clinch third at 15 under and JB Holmes, Rickie Fowler and McIlroy tying for fourth one further shot adrift.
“I feel good. Just all the work ever since I was a little kid trying to get to No1 in the world and today I did it, which was great,” said Day. “To have an opportunity, knowing I had to win this week to gain that spot and stepping up and doing it was fantastic.”
He follows in the steps of a fellow Queenslander, Greg Norman, in achieving the world No.1 ranking.