Dustin Johnson boosted his chances of breaking his own tournament record at the 2017 HSBC Champions on Friday after a second-round 63 saw him move into the lead at Sheshan Golf Club in Shanghai, China.
The 2013 champion climbed 10 places to the top of the leaderboard and holds a one-stroke advantage over compatriot Brooks Koepka, whose second-round 68 wasn't sufficient to keep his spot at the head of the leaderboard.
Johnson ended his 2013 tournament on 24 under par, a score that is yet to be beaten in this tournament, and he's on course to best that tally four years on following a heroic Thursday outing.