Louis Oosthuizen and Adam Scott remained inseparable at the top of the leaderboard as the second round of the World Golf Championships-HSBC Champions began at Mission Hills.
After opening 65s, both players raced to four under for the day on the front nine to reach 11 under for the week on the resumption of play.
South African Oosthuizen initially made a sluggish start with a bogey at the second, but after birdies at the third and fifth steadied the ship the former Open Champion’s putter caught fire with a 50 footer for eagle at the seventh and 30 foot birdie effort at the next both dropping.
Australian Scott was more consistent, carding a hattrick of gains from the third and two-putting the long seventh for birdie.
The pair were two clear of American Phil Mickelson; the four-time Major winner birdieing the first and eagling the long third to be three under for the day through four holes.
Sweden’s Carl Pettersson turned six under for his round to be alongside defending champion Martin Kaymer, Ireland’s Shane Lowry, Thailand’s Prom Meesawat and Masters Champion Bubba Watson in a tie for fourth on eight under.
Oosthuizen birdied the long ninth and followed that with a 35 foot effort at the tenth to be five under for his last four holes. At 13 under he had a two shot lead over Scott, who parred the eighth and ninth to turn in 32.