It was a day for grinding at Firestone and Jason Day was up for the challenge in the Bridgestone Invitationall in Ohio today, vaulting to the lead.
Day had to scramble for much of his second round and closed with a sloppy three-putt bogey from the left fringe at the 18th, but his one-under 69 was enough to vault him from three shots back to a one-shot lead in the $US9.5 World Golf Championship event in Akron.
Australia's world No. 1 was two shots clear of the field and holding a wedge in his hand at 18, but he turned his approach over and then powered his birdie putt from the fringe at 18 through the break, missing the two-metre par-saver back to reduce the lead to one shot over David Lingmerth of Sweden.
"I was very cross with myself when I was walking off," Day said. "The great thing is that once I do silly things like that on 18, I soon forget about it, and I just need to start focusing on tomorrow's round.
"But I know that I'm putting good because I'm holing putts. And if I can give myself the opportunities, I'm hoping that I can stretch that lead over 54 holes, and then hopefully by 72 holes, I can stretch that lead even more."
Still, Day made more than his share of par-saving putts, including a trio at the seventh, eighth and ninth that kept his momentum running, and he finished at three-under overall.
It was a tough day for all the players, but Adam Scott also is on the leaderboard, tied-sixth through two rounds after a fine 68 today, playing alongside day.
Scott bombed a 15-metre birdie at the 17th that put him just a shot from the lead, but then a tugged tee shot on the 18th cost him a shot.
Meanwhile Greg Chalmers is in the mix at the Barracuda Championship in Reno, Nevada, after a second-round of 10 points in the modified stableford event that is part of the US PGA Tour.
The winner gets automatic qualification for the Open Championship at Royal Troon.