Aug 28 (Reuters) - Wall Street's main indexes were flat

at the open on Wednesday ahead of Nvidia's earnings report, with

focus squarely on whether the recent bull market rally led by

the AI chip firm and other tech-related shares can be sustained.

The Dow Jones Industrial Average fell 0.33 point, or

flat, at the open to 41,250.17. The S&P 500 opened lower

by 1.29 points, or 0.02%, at 5,624.51, while the Nasdaq

Composite dropped 16.02 points, or 0.09%, to 17,738.80

at the opening bell.