Key facts
- S&P 500 and Nasdaq opened higher on Tuesday.
- Easing oil prices supported risk appetite.
- Key corporate earnings and the Federal Reserve's interest-rate decision are expected this week.
US stocks opened higher on Tuesday, with the S&P 500 and Nasdaq Composite gaining ground as falling oil prices supported investor sentiment. The Dow Jones Industrial Average, however, edged lower at the open. Investors are awaiting a week of key corporate earnings reports and the Federal Reserve's interest-rate decision.