Dustin Johnson's birdie at the 18th hole Saturday gave him a third-round 69 and kept alive a streak; it was DJ's eighth consecutive round in the 60s.
That's just one of the things You Oughta Know going into Sunday's final round of the Tour Championship, where Johnson and Kevin Chappel are tied for the lead and Rory McIlroy is two strokes back.
• Johnson's scoring average over his last eight PGA Tour rounds is a sizzling 66.63.
• After winning the BMW Championship two weeks ago, Johnson is trying to convert a 54-hole lead or co-lead for the second consecutive tournament.