Stocks: 4 things to know before the open

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After a volatile week, Friday promises more of the same.

Here are the 4 things you need to know before the opening bell rings in New York:

1. Even more earnings: Chevron (CVX), MasterCard (MA) and Mattel (MAT) are reporting earnings before the opening bell.

Chevron earnings will be a particular focus as investors look for signs of how rock-bottom crude prices are affecting the company's plans. Mattel shares tumbled nearly 5% premarket after the company said sales and profits fell in the fourth quarter. Barbie sales dropped 12%.

U.S. stock futures were sharply lower ahead of the open.

On Thursday, the Dow Jones industrial average rose 1.3%, while the S&P 500 and the Nasdaq gained 1.0%.

2. Amazon jumps: Online retail giant Amazon (AMZN) reported earnings Thursday that beat Wall Street's expectations. Its shares soared by more than 11% in premarket trading. Google (GOOG) shares were also firmer premarket.

3. A little bit of data: The University of Michigan will report the final version of its January consumer sentiment index at 9:55 a.m. ET.

Related: Fear & Greed Index

4. International markets overview: European markets opened firmer on Wall Street's gains, but turned lower in morning trade.

Greek stocks were steady, with banks continuing to recover after slumping earlier this week on fears about the future of the country's international bailout. Greek Prime Minister Alexis Tsipras will meet eurozone officials in Athens Friday for the first time since winning Sunday's election.

Russia slashed interest rates to 15% from 17% in a bid to prevent an even deeper recession.

Asian markets ended mixed. The Shanghai Composite shed 1.6% and the Hang Seng lost 0.4%. Japan's Nikkei gained 0.4% as the yen weakened.

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