By Anora Mahmudova and Barbara Kollmeyer, MarketWatch

Whole Foods, Coach jump

NEW YORK (MarketWatch) -- U.S. stocks lost ground on Tuesday, as investors fretted that the Federal Reserve might raise interest rates sooner than expected in the wake of fresh signs that the economy is gaining strength.

The S&P 500 (SPX) was down 5 points, or 0.3%, lower at 1,933.67. The Dow Jones Industrial Average (DJI) dropped 39 points, or 0.3%, to 16,529.08. The Nasdaq Composite (RIXF) fell 9 points, or 0.2%, to 4,375.24.

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Chris Gaffney, senior market strategist at EverBank Wealth Management, said those investors worried about the possibility of faster rate hikes fear that the Fed is behind the curve, given the rapid growth in the economy.

"We still think the environment for stocks is good as interest rates are low and the economy is improving," he said. "The 4.5% gain on the S&P 500 since the start of the year is modest and we don't see it as overheating."

Also read: What's so bad about higher interest rates?

The day's economic news showed U.S. service-sector companies expanded in July at the faster pace in nine years, according to survey of senior executives.Meanwhile, factory orders in June climbed to the highest level on record and topped estimates compiled by MarketWatch.

Earnings, deal talk in focus

Among individual companies, shares of Whole Foods Markets Inc. (WFM) rallied 5% amid heavy volume on reports that activist investor Carl Icahn may be interested in the stock. However, other reports said his office denied such rumors. The stocks is the biggest gainer on the S&P 500 this morning.

Target Corp. (TGT) shares fell 2.6% after the retailer lowered its outlook.

Better-than-expected earnings lifted Coach Inc. (COH) 4.3%

Motorola Solutions Inc. (MSI) fell 3.1% after the networking-systems company reported a drop in second-quarter sales and guidance for the current period came in weaker than expected. See today's notable Movers & Shakers.

Walt Disney Co. (DIS) will report fiscal third-quarter results after the market closes, and analysts expect profits to rise. Marvel Studios, owned by Disney, saw a blockbuster opening weekend for "Guardians of the Galaxy". See earnings preview for Disney

Bulls or bears in control?

Wall Street stocks recouped some of last week's heavy losses on Monday, with the S&P 500 (SPX) closing up 0.7% to 1,938.99, its first gain in three sessions. The Dow Jones Industrial Average (DJI) finished up 0.5% to 16,569.28, snapping a four-day losing streak.

Some strategists said this week could determine whether the bulls or bears are in control after last week's sizable selloff, tied to the view that a sooner-than-expected rate hike is on the cards.

"The trading action of the rally [Monday] was similar to that of previous rebounds during the 'buy the dip' environment," said Michael O'Rourke, chief trading strategist of Jones Trading, in a note to investors. The ensuing short scramble was "so aggressive that Russian's sabre rattling" -- news that it had 160 tanks and 33,000 troops on Ukraine's border -- "didn't even cause a blip."

O'Rourke added that important resistance for S&P 500 is at 1,960, with support at 1,930 and 1,920. (Also see: What is next for the S&P 500, 1,800 or 2,000? http://www.marketwatch.com/story/what-is-next-for-the-sp-500-1800-or-2000-2014-08-04.)

In other markets, the Nikkei 225 index fell to its weakest closing level in more than a week, after the HSBC China services purchasing managers index came in at the lowest reading in the nearly nine-year history of the index. China is a big export market for Japan manufacturers. Other Asian markets were generally lower as well.

European stocks took some inspiration from Wall Street gains on Monday. September futures contracts for both crude oil (CLU4) and gold (GCU4) were marginally lower, while the dollar (DXY) was holding steady.

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