SHENZHEN, China -- Louis Oosthuizen shot a 9-under 63 on Friday to open up a five-stroke lead after the second round of the HSBC Champions at Mission Hills.
The 2010 British Open champion, the co-leader overnight, had eight birdies and an eagle to offset one bogey. He was at 16-under 128 going into the weekend.
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Els, who had been in a share of 19th place after the first round, made seven birdies on the front nine for a 29 -- the lowest nine-hole score of the day. He finished with a 63.
Oosthuizen again made the most of the five par-5s on the Olazabal Course at Mission Hills, birdying four and making eagle on the 566-yard seventh. He birdied all five par-5s in the first round on Thursday.
The South African nearly had a second eagle on Friday, too. After hitting his second shot into a bunker on the par-5 ninth, he hit a difficult chip shot over a ridge and onto the green that rolled 15 feet and missed the pin by inches.
Oosthuizen is having one of his best years on tour, with two titles and a runner-up finish to Bubba Watson after a playoff at The Masters. He says the highlight was the albatross he hit on the par-5 second hole in the final round at Augusta.
He's not expecting to repeat the feat at Mission Hills, but is hoping he can keep hitting well off the tee on the long holes to bag as many birdies as he can.
Mickelson, a two-time HSBC Champions winner, played a superb front nine with two eagles and two birdies to move into a share of second place with Scott at the turn.
But on the 18th he barely cleared the lake and landed in the rough on a steep slope next to the green. Balanced awkwardly with one foot on a rock and the other on the hill, he missed the ball completely with his first swing. He popped it onto the green with his second attempt but then missed a 10-foot putt for bogey.
Scott, the co-leader with Oosthuizen after the first round, made four birdies to keep pace on the front nine before blundering an opportunity for birdie on the par-5 ninth, which he had eagled the day before.
After positioning himself well with a deep second drive that nearly reached the green, the Australian left his chip shot short, setting up a difficult 10-foot putt that he missed, resulting in a par.
Scott's struggles continued on the back nine with three bogeys to go along with his three birdies.