Stocks: 5 things to know before the open

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The holidays are over. The trading week is set to begin. It's go time.

Here are the five things you need to know before the opening bell rings in New York:

1. Euro slump deepens: The euro continues to plunge against the U.S. dollar as concerns intensify that Greece may be forced to leave the eurozone if the country elects a radical, anti-austerity government at the end of the month.

"The euro breached $1.20 overnight, and continues to trade below that important technical level," said Tom Beevers, CEO at StockViews in London.

The euro has been declining as the U.S. dollar strengthens and Europe teeters on the brink of recession and deflation.

2. Oil slides again: Crude futures are slipping by about 1% and are now trading around $52 per barrel. Oil prices were halved last year as the world faced a supply glut.

"Increasing oil production -- particularly from Russia and Iraq -- coupled with fears for weaker global demand, has continued to push oil lower," said Beevers.

Related: Fear & Greed Index

3. Consumer Electronics Show: It's a big week for many technology firms as the International Consumer Electronics Show gets underway.

CES, which runs through Thursday, has been the launchpad for some stunning hits, but also some epic flops.

The Las Vegas show features more than 3,600 exhibitors and is attended by roughly 160,000 people.

Related: CNN Money's Tech30

4. Stocks send mixed messages: U.S. stock futures are inching lower ahead of the open, but the move is small.

European markets are bouncing around in early trading, with no clear upward or downward trend.

Asian markets ended with mixed results. The standout performer was the Shanghai Composite index, which surged by 3.6% over the course of the day.

On Friday, stock markets were mostly flat. The Dow Jones industrial average edged up by 0.1%, while the S&P 500 was essentially unchanged and the Nasdaq slid by 0.2%.

5. Expecting auto sales: Throughout the day, automakers will be releasing data on December car and truck sales.

It's expected that truck and SUV sales may have outpaced car sales.

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