* U.S. economy grows 2.8 pct in Q3, less than expected
* HP Q4 results meet prelim figures, buyback increased
* Case/Shiller, consumer confidence data on tap
* Futures: S&P up 2 pts, Dow up 3 pts, Nasdaq down 1.25
* For up-to-the-minute market news, click [STXNEWS/US]
(Adds GDP data, updates prices and quote)
By Ryan Vlastelica
NEW YORK, Nov 24 (Reuters) - U.S. stock index futures pointed to a flat open on Tuesday after data showed the U.S. economy grew in the third quarter, but at a slower-than-expected pace.
The economy grew at a 2.8 percent annual clip, revised down from 3.5 percent estimated last month, the Commerce Department said. Analysts forecast a 2.9 percent rate. For details, see [ID:nN23258482]
Reduced inventory "sets [the market] up for a better fourth quarter GDP with more restocking," said John Canally, economist at LPL Financial in Boston. "I don't expect a whole of market reaction. There will be more data later today which will be fresher."
November consumer sentiment data and the September Case/Shiller housing price index are also on tap and could provide insight into how firmly a recovery has taken hold.
S&P 500 futures SPc1 rose 2 points and were modestly below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures DJc1 were up 3 points, while Nasdaq 100 futures NDc1 slid 1.25 points.
Hewlett-Packard Co (HPQ.N) reported a quarterly profit that matched its preliminary results late Monday, and said that while the economy remained challenging, it saw signs of a recovery. For details, see [ID:nN23242457]
Additional reporting by Richard Leong; editing by Jeffrey Benkoe