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Thu, Apr 24, 2014, 4:02 PM EDT - U.S. Markets closed

Ahead of earnings: Amazon faces tough battles as sales growth slows

As growth in Amazon's basic online marketplace has slowed, CEO Jeff Bezos is looking for new opportunities. But whether its online video, tablets and phones, or cloud computing service, nothing is coming easy. And a couple of major challenges may hit its core business later this year, too.