World number one Tiger Woods claimed a share of a one-stroke halfway lead at the World Golf Championships-HSBC Champions after carding a second consecutive five-under-par 67 in Shanghai.

First-round leader Nick Watney battled to a two-under 70 to join Woods at 10-under-par overall, with Spaniard Alvaro Quiros joining world number two Phil Mickelson and Ryan Moore at the head of the chasing pack, just one shot off the pace.

Former champion Mickelson posted a bogey-free six-under-par second round, while Qatar Masters champion Quiros dropped just one shot in his 66 with Moore carding a hard-fought 69.

At the top of a tightly congested, American-dominated leaderboard, Volvo World Match Play Championship finalist Anthony Kim (69) claimed sixth at eight under with Pat Perez (69) a further shot back and Brian Gay (69) at six under with India's Jyoti Randhawa (70).

Woods was just one under through the turn but made his move on the back nine as a brilliant chip-in birdie on the 16th and a fourth gain in eight holes at the last earned the two-time HSBC Champions runner-up a share of the lead.

"I got off to a good start and birdied the very first hole, but after that, I didn't really make any putts," said Woods.

"I certainly had some looks at them and didn't really capitalise on anything and made a putt at nine and from then on I hit a lot of good putts and played the last 10 holes in five under.

"It was a little bit frustrating not holing the putts, but the guys weren't really running off and hiding and I knew that if I could play the back nine in three under that would be a pretty good number and I was able to do a couple better than that."

Big-hitting Quiros has struggled for form since his thrilling win in Qatar at the start of the year with only a second place at The European Open to show for his efforts, but his second eagle of the week early in his second round set the Spaniard on the way to posting five birdies against just a solitary bogey.

"I'm hitting the ball okay, nothing great, but nothing bad either," he said.

"I've been very lucky because the shots I missed were very playable and I made a good recovery."

Mickelson, the 2007 champion, also waited until the back nine to kick-start his round as a second chip in of the day at 15, from thick rough, headlined a run of three birdies over his final four holes.

He said: "It was a good round. I played well to shoot six under.

"I had a couple of chip-ins which was nice and kept the ball in play throughout the day and then made a couple of birdies at the end.

"I'm pleased with where I have put myself after two rounds, I have put myself in a good position heading into the weekend.

"There's a lot of guys there and I'll need to play very well on the weekend, but I'm in a good position."

Collated second-round scores (Gbr & Irl unless stated, par 72):

134 Nick Watney (USA) 64 70, Tiger Woods (USA) 67 67

135 Phil Mickelson (USA) 69 66, Ryan Moore (USA) 66 69, Alvaro Quiros (Spa) 69 66

136 Anthony Kim (USA) 67 69

137 Pat Perez (USA) 68 69

138 Brian Gay (USA) 69 69, Jyoti Randhawa (Ind) 68 70

139 Koumei Oda (Jpn) 70 69, Ryo Ishikawa (Jpn) 72 67, Wen-Tang Lin (Tpe) 67 72, Camilo Villegas (Col) 70 69

140 Francesco Molinari (Ita) 73 67, James Kingston (Rsa) 70 70, Jason Dufner (USA) 69 71, Ross Fisher 70 70, Matt Kuchar (USA) 68 72, Martin Kaymer (Ger) 66 74, Thongchai Jaidee (Tha) 71 69, Shane Lowry 66 74, Paul Casey 67 73

141 Soren Kjeldsen (Den) 69 72, Rodney Pampling (Aus) 69 72, Garth Mulroy (Rsa) 69 72, Daisuke Maruyama (Jpn) 72 69, Simon Dyson 72 69, Rory McIlroy 73 68, Alexander Noren (Swe) 70 71, Ernie Els (Rsa) 70 71, Ian Poulter 72 69, Henrik Stenson (Swe) 69 72, Lee Westwood 70 71

142 Rory Sabbatini (Rsa) 74 68, Robert Allenby (Aus) 73 69, Retief Goosen (Rsa) 71 71

143 Oliver Wilson 71 72, Scott Strange (Aus) 71 72, Yong-eun Yang (Kor) 72 71, C Muniyappa (Ind) 74 69, Lian-Wei Zhang (Chn) 73 70, Padraig Harrington 74 69, Shingo Katayama (Jpn) 75 68

144 Peter Hanson (Swe) 72 72

145 Jeev Milkha Singh (Ind) 73 72, Sergio Garcia (Spa) 75 70, Ashun Wu (Chn) 74 71, Stewart Cink (USA) 71 74, Mark Brown (Nzl) 71 74, Chih-bing Lam (Sin) 71 74, Danny Lee (Nzl) 74 71, Ricardo Gonzalez (Arg) 74 71, Sean O'Hair (USA) 74 71, Chapchai Nirat (Tha) 71 74

146 Jerry Kelly (USA) 71 75, Greg Chalmers (Aus) 72 74, Geoff Ogilvy (Aus) 72 74, Yuta Ikeda (Jpn) 73 73, Wen-chong Liang (Chn) 73 73, Michael Jonzon (Swe) 72 74, Martin Laird 72 74, Gonzalo Fdez-Castano (Spa) 73 73

147 Steve Marino (USA) 77 70, Mark Murless (Rsa) 71 76, Richard Sterne (Rsa) 74 73

148 Daniel Vancsik (Arg) 74 74, Jeppe Huldahl (Den) 76 72, Nick Dougherty 68 80, Peter Hedblom (Swe) 77 71

150 Christian Cevaer (Fra) 73 77, Prayad Marksaeng (Tha) 81 69, Gaganjeet Bhullar (Ind) 74 76

151 Anthony Kang (USA) 75 76

152 Thomas Aiken (Rsa) 74 78, Wei-Huang Wu (Chn) 74 78

154 Jean Hugo (Rsa) 78 76, Thomas Levet (Fra) 77 77

156 Nathan Green (Aus) 79 77