U.S. stock futures wavered Tuesday as investors awaited second-quarter results from the biggest banks for insights into the health of the American economy and its lenders.

Futures tied to the S&P 500 drifted between gains and losses, suggesting that U.S. stocks may face another day of turbulence after the opening bell. A rally in the equity market on Monday fizzled after California rolled back some of its reopening plans, stoking fears about additional lockdowns.

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