July 29 (Reuters) - Wall Street's main stock indexes opened

lower on Wednesday as investors awaited the Federal Reserve's

monetary policy verdict against a backdrop of simmering Middle

East tensions, while chip stocks struggled ahead of Big Tech

earnings later this week.

The Dow Jones Industrial Average fell 73.1 points, or

0.14%, at the open to 52674.21. The S&P 500 fell 10.6

points, or 0.14%, at the open to 7418.16​, while the Nasdaq

Composite dropped 13.4 points, or 0.05%, to 24863.48 at

the opening bell.