Indian benchmark indices Sensex and Nifty are likely to open sharply lower on Wednesday, with GIFT Nifty plunging 1 percent, signalling a weak start despite gains across Asian markets and Wall Street. A renewed rally in global technology stocks, driven by optimism around artificial intelligence, has lifted global sentiment. However, Indian equities could be weighed down by a fresh surge in crude oil prices, escalating geopolitical tensions and caution ahead of the US Federal Reserve's policy decision.