Dow futures rebounded 260 points Tuesday, one day after the 30-stock average slumped more than double that amidst Wall Street’s September slide. The Dow ended 614 points, or nearly 1.8%, lower in its worst session since July. The Dow was down 971 points at Monday’s low, which had been almost 5.7% below last month’s intraday all-time high. Investor concern included risks over this week’s Federal Reserve meeting, elevated Covid cases in the U.S., debt ceiling brinkmanship in Washington, and possible financial market contagion from embattled Chinese developer Evergrande. The Nasdaq and S&P 500 on Monday had their worst days since May, sinking 2.2% and 1.7%, respectively. Both were also off more than 5% from their all-time intraday highs from earlier this month.