Keep a close eye on the first couple hours of trading after the opening bell, says Kevin Green. He believes the stock market's reaction to Nvidia's (NVDA) earnings in that time will determine the direction of trading for the remainder of the day. KG also offers more insight into Nvidia's earnings and the metrics pointing to a strengthening AI race, including data center revenue that nearly doubled year-over-year. Walmart's (WMT) in-line earnings and soft guidance showed some weakness in retail, while Intuit (INTU) experienced steeper selling in its report.