Aug 3 (Reuters) - Main U.S. stock indexes opened higher on

Monday as signs of de-escalating tensions in the Middle East

dragged down crude prices, while investors prepared for another

week packed with earnings and economic data.

Amazon.com ( AMZN ) rose 3.8% and hit $3 trillion in market

value for the first time.

The Dow Jones Industrial Average increased 274

points, or 0.52%, at the open to 52,759.06. The S&P 500

rose 15.1 points, or 0.2%, to 7,504.78​ and the Nasdaq Composite

gained 78.8 points, or 0.31%, to 25,452.663 at the

opening bell.

(Reporting by Johann M Cherian in Bengaluru; Editing by Joyjeet

Das)