Tony Finau has enjoyed such a good year he wasn't about to let one bad break get him down at the WGC-HSBC Champions tournament in Shanghai.

Finau had just built a three-shot lead as Patrick Reed began to stumble on Friday, when he hit an approach from the rough on the 11th toward the green at Sheshan International.

The ball landed on a sprinkler, shot high in the air and rolled over the back and into the hazard. It led to a double bogey and cut Finau's lead to one shot.

However he didn't flinch.

He had a pair of birdies on the par 5s, laid up on the reachable par-4 16th and made birdie, and wound up with a 5-under 67.

That put him at 11-under 133, three shots clear of Reed (72), Tommy Fleetwood (68) and defending champion Justin Rose (67).

"That was about as bad a break as I've ever had, to kick all the way over the green into the hazard," Finau said.

"One thing I've learned in this game, you take the good with the bad and keep moving forward.

"I knew I was playing well still and still at the top of the leaderboard. Just keep plugging along and try to get that back and I was able to do that."

Reed opened with a pair of quick birdies in a swirling wind that came out of the opposite direction of the first round.

He made his first bogey of the tournament on the fifth hole of the second round by missing a 4-foot putt after a smart chip shot from deep rough.

Then, he hit into the water on No. 6 and had to scramble to make bogey. He also hit into the water on the par-5 eighth but his short game allowed him to save par.

The Masters champion looked certain to drop another shot on the par-5 18th when his tee shot bounded off the side of a hill and into the water.

Reed took his penalty drop, and then tried to hit a slice over two portions of the water. He blasted his hybrid on to about 12 feet for a two-putt birdie and a 72.

Fleetwood birdied the 18th hole to join Reed and Rose at 8-under 136.

Xander Schauffele was another shot behind after a 71, while Patrick Cantlay wasted a good birdie chance on the final hole and had to settle for 68. He was five behind.

Rose has a chance to return to No. 1 with a victory and it doesn't look as though Brooks Koepka can put up much of a fight.

Koepka, in his debut at No. 1, was frequently stretching his back and at times walking with an uncomfortable gait. He also missed several short putts and shot 74, leaving him 13 shots back.