By the numbers: Key stats from Day's 61-63 start

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Jason Day is at it again, and he leads by five strokes heading into the weekend at the BMW Championship. Here are some notable statistics, courtesy of the Golf Channel research department:

• 61-63; 124 ties lowest 36-hole opening score in PGA Tour history

• Four shots better than any opening 36-hole score this season

• Four of last eight competitive rounds have been 63 or lower

• Combined 97 under over last 26 PGA Tour rounds

• Birdied/eagled 33.7 percent of holes played since PGA Championship began

• Five-shot, 36-hole lead ties largest this season (Jordan Spieth at Masters)

• 10 under on par 4s through 36 holes this week

• Third in strokes gained-putting this week, first in tee-to-green

• Can become No. 1 this week with top-2 finish

• Trying to become third Australian player to reach No. 1 (Greg Norman, Adam Scott)

• Would reach No. 1 at younger age than both Norman and Scott

• Seeking fifth win this season; would tie for most by Australian player

• Jim Ferrier won five times in 1951 (did not win major in season)

• Last player to win five or more times in season not named Tiger WoodsVijay Singh in 2004 (nine)