You Oughta Know: Day will move to No. 1 with a win

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Jason Day leads by six and is on the verge of taking over as the No. 1 player in the Official World Golf Ranking. Here's what You Oughta Know heading into the final round of the BMW Championship at Conway Farms.

• Day is in search of his seventh PGA Tour win and fifth this season. He would become only the fifth player in the last 20 years to win five or more times in the same season, joining Tiger Woods, who did it 10 times, and Vijay Singh, who did it in 2004.

• Day would also become the third player to win a major and multiple FedEx Cup Playoff events in the same year, joining Woods (2007) and Rory McIlroy (2012).

• Six shots clear of the field, Day will vault to No. 1 in the world for the first time with a win. Should he not hold on, he can still take over the top spot by finishing solo second, so long as Rory McIlroy finishes outside the top four and Jordan Spieth finishes outside the top 10. McIlroy is currently solo fourth, and Spieth tied for 11th.

• Day would become just the third Australian to reach No. 1, joining Greg Norman and Adam Scott, and at age 27 would be the youngest of the three to do it.

• Prior to this week, the season's largest 54-hole lead was held by J.B. Holmes, who led by five at the WGC-Cadillac at Doral. Holmes lost his lead to Dustin Johnson

• Day's 20-under total is the lowest 54-hole score to par this season. In his last seven PGA Tour starts, dating back to the Open Championship, he's a combined 99 under par.

• No surprise given the preceding stat, Sunday would mark Day's fourth win in his last six events. The last four times that's happened? Woods in 2006, 2007, 2008 and 2009.

• As for the rest of the field, Piercy is looking to play spoiler and pick up his second win of the year, following a victory at the Barbasol Championship, played opposite the British. He's 16 for 17 on putts made inside of 15 feet this week. His 14-under 199 is the lowest 54-hole total of his career. The 36-year-old is looking to make the Tour Championship for just the second time.

• Berger first made himself known to wider audiences with his appearance earlier this year in a playoff at the Honda Classic, where he lost to Padraig Harrington. He had missed seven straight cuts before a T-12 finish last week at Deutsche Bank.

• McIlroy could hold onto the No. 1 ranking with a win of his own tomorrow. The largest 54-hole deficit he has ever overcome was four shots at the 2010 Wells Fargo Championship, his first PGA Tour victory. He's played his last four rounds a combined 18 under par.

• Finally, Spieth has had, thus far, a postseason to forget. He missed the cut at both the Barclays and the Deutsche Bank and although he's currently tied for 11th, his 1-over 72 Saturday marked the fifth time in his last seven rounds he's been over par. Spieth did not make a putt longer than 8 feet in the third round.