Aug 27 (Reuters) - Wall Street's main indexes opened

lower on Tuesday as caution prevailed ahead of highly

anticipated results from Nvidia and crucial economic data

expected later in the week.

The Dow Jones Industrial Average fell 54.24 points,

or 0.13%, at the open to 41,186.28. The S&P 500 opened

lower by 13.95 points, or 0.25%, at 5,602.89, while the Nasdaq

Composite dropped 70.24 points, or 0.40%, to 17,655.52

at the opening bell.