Woods kicked his driver in anger after a wayward shot on the 18th and was evidently still smarting long after his round after snubbing a news conference.
World number two Tiger Woods mixed birdies with bogeys before taking his frustration out on his clubs after dropping to tied ninth after the second round of the HSBC Champions tournament on Friday.
The American, whose long reign as world number one was officially ended by Briton Lee Westwood on Monday, lipped the pin five times, twice with short putts, and cancelled out five birdies with a corresponding number of bogeys to finish with par 72 to lie five shots behind leader Francesco Molinari of Italy.
Woods kicked his driver in anger after a wayward shot on the 18th and was evidently still smarting long after his round after snubbing a news conference.
"I struggled a little bit today," the American said in a statement e-mailed by organisers to reporters. "The pins were tough. I didn't hit very good, so the score could have been worse, but also it could have been a lot better."
Westwood carded a two-under-par 70 to remain one off the lead.
The Englishman produced three birdies during another solid performance but the 37-year-old missed on a likely fourth when he ignored his caddie's advice over the choice of club on his second shot out of the rough on the 18th.
"Billy (Foster) said it would be best to lay up and go with a full shot because of where the flag was cut," Westwood said.
"I obviously knew better as a player and hit a five-wood and left it in just about the worst place I could. But today, as per usual, I should have listened to my caddie."
Westwood, on eight-under-par, is in a strong position to defend his number one world ranking from Woods, Phil Mickelson and German Martin Kaymer who could all take over at the top with a victory in Shanghai.
Defending title holder Mickelson is also tied ninth on four under par after scoring a second-round 71.
Kaymer carded a three-under 69 for tied 18th with three-under-par overall.
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