India, Aug. 18 -- U.S. stock futures were under pressure on Tuesday, August 18, as rising oil prices, higher Treasury yields and fading hopes of a U.S.-Iran peace deal weighed on investor sentiment. Nasdaq futures led declines, while Dow futures remained nearly flat.

US Stock Futures Today

At around 6:40 a.m. ET, Dow E-minis were up 18 points, or 0.03%, while S&P 500 E-minis fell 36.75 points, or 0.47%. Nasdaq 100 E-minis dropped 362.75 points, or 1.21%. The moves suggest a cautious start on Wall Street as investors assess geopolitical risks, oil prices, bond yields and the Federal Reserve's interest-rate outlook.

S&P 500 Futures Today

S&P 500 futures fell about 0.47%, pointing to a weaker opening for the broader U.S. stock market. Ri...