Day new No. 1 as Grillo, Sullivan crack top 50

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Jason Day has once again ascended to the top of the world rankings, but this time he did it without hitting a shot.

Thanks to the divisor math involved in the Official World Golf Ranking, Day overtook Jordan Spieth for the No. 1 spot even though neither of them played last week. This marks Day's second time on top, and it ends another brief reign for Spieth, who became No. 1 with his season-ending Tour Championship win last month.

Day's point average is now 12.4235, while Spieth clocks in at 12.3963.

Meanwhile a little further down the list, a pair of young champions made big moves. Emiliano Grillo jumped from No. 72 to No. 36 thanks to his win at the Frys.com Open, his second win in the last three weeks.

The victory moved Grillo into the top 50 for the first time in his career, as did Andy Sullivan's nine-shot romp at the Portugal Masters. Sullivan became the first three-time winner this year on the European Tour, and he moved up 19 spots to No. 47 as a result. By moving into the top 50, both players also earned spots in next month's WGC-HSBC Champions.

Other big moves included Kevin Na, who went from No. 33 to No. 24 thanks to his runner-up finish in Napa, and Charl Schwartzel, who moved up five slots to No. 43 with a T-6 finish. Justin Thomas jumped from No. 75 to No. 62 with a career-best T-3 finish, while Matt Kuchar's win in Fiji bumped him up three spots to No. 13.

One notable drop is Ian Poulter, who fell five spots to No. 51. Poulter started the year ranked 27th, and this marks the first time the Englishman has been outside the OWGR top 50 since September 2006.

Behind Day and Spieth, the rest of the top 10 remained unchanged. Rory McIlroy, Bubba Watson and Rickie Fowler round out the top five, followed by Henrik Stenson, Justin Rose, Dustin Johnson, Jim Furyk and Zach Johnson.

Tiger Woods is now 334th, a drop of 302 spots since the end of 2014.