"Nvidia's Earnings Forecast Drives S&P 500 Futures Lower"

U.S. stock-index futures are trading lower as investors await earnings reports from big retailers like Walmart and Home Depot, as well as crucial results from Nvidia. The holiday-shortened week is starting on a cautious note, with potential catalysts including the release of the Federal Reserve’s minutes and economic updates. Nvidia's earnings, set to be released after Wednesday’s market close, are highly anticipated, with its performance likely to impact broader market sentiment.