By Victor Reklaitis and Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks slid Monday, adding to Friday's drop, which was led by once-highflying biotech and Internet stocks.

Asian and European markets have joined in the tech-led slump. With Monday's session light on economic data, investors are looking ahead to the start of first-quarter earnings season, and some analysts sound downbeat about the coming reports.

The S&P 500(SPX) was last down 20 points, or 1.1%, to 1,844.88, while the Dow Jones Industrial Average(DJI) shed 144 points, or 0.9%, falling to 16,267.35 after briefly turning positive. The Nasdaq Composite(RIXF) slid 59 points, or 1.4%, to 4,068.67.

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On Friday, the Nasdaq fell 2.6% for its worst drop in two months. The tech-heavy index suffered a weekly loss of 0.7%, while the S&P 500 and Dow managed weekly gains of 0.4% and more than 0.5%, respectively.

Compared with last week, this week is short on top-tier economic data, so investors are likely to focus instead on earnings reports from the first quarter. Alcoa Inc. (AA), the aluminum producer and former Dow component, unofficially kicks off the earnings season on Tuesday, when it reports results after the closing bell.

"The selloff of high-growth stocks on Friday spilled over to the rest of the market for the first time and it is worrying," said Channing Smith, managing director at Capital Advisors.

"With the economy still muddling through and earnings projected to rise ever so slightly, there are doubts about current valuations, especially among highflying companies on the Nasdaq," he added.

"The weakness has carried over from Friday. It is hard to imagine how the SPX went from a new all-time high to down on the year in just two days, but it happened. The momentum names and technology names were the first to crack, now we are seeing signs that weakness is moving to the overall market," said Ryan Detrick, senior technical strategist at Schaeffer's Investment.

Other analysts have said they're a little skeptical of the naysayers, adding that this will be the 16th quarter or so in a row where we are being cautioned about earnings.

Among individual stocks on Monday, Internet names TripAdvisor Inc.(TRIP) and Baidu Inc. (BIDU) were among the Nasdaq's worst performers. They're down 5.2% and 5.4%, respectively, adding to their recent losses.

On the plus side, Questcor Pharmaceuticals Inc.(QCOR) surged 15% after news that Mallinckrodt (MNK) will buy the drug maker for about $5.6 billion. (Read more in the Movers & Shakers column http://www.marketwatch.com/story/questcor-surges-on-buyout-mannkind-sinks-2014-04-07.).

Peabody Energy Corp. (BTU) shares rose 0.4% after the stock's rating was raised to outperform from market perform at Cowen & Co. last week.

Netflix Inc. (NFLX) shares fell 0.6%, adding to a 4.9% drop on Friday. Pandora Media, Inc. (P) dropped 8.5%. Netflix and Pandora are one of the handful of momentum stocks that got caught up in Friday's rout.

In other markets, Asian and European stock markets lost ground Monday. The dollar (DXY) edged lower, and oil prices fell, with Brent taking the biggest hit on reports that Libya may soon reopen two oil ports. Gold futures dipped and traded below $1,300 an ounce.

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