Jan 29 (Reuters) - Wall Street's main stock indexes were muted at open on Monday, ahead of major events this week including the Federal Reserve's interest rate decision and big-ticket tech earnings that could test a record-breaking rally.

The Dow Jones Industrial Average rose 6.40 points, or 0.02%, at the open to 38,115.83. The S&P 500 opened higher by 1.98 points, or 0.04%, at 4,892.95, while the Nasdaq Composite gained 15.29 points, or 0.10%, to 15,470.66 at the opening bell. (Reporting by Ankika Biswas in Bengaluru; Editing by Shinjini Ganguli)