Dec 9 (Reuters) - Wall Street's main indexes opened flat

to lower on Monday, after the S&P 500 and the Nasdaq notched

record closing highs in the previous session on upbeat corporate

forecasts, while investors awaited a key inflation report this

week.

The Dow Jones Industrial Average fell 4.5 points, or

0.01%, at the open to 44,637.97. The S&P 500 fell 7.3

points, or 0.12%, at the open to 6,083.01​, while the Nasdaq

Composite dropped 35.7 points, or 0.18%, to 19,824.09 at

the opening bell.