Indian equity benchmarks Sensex and Nifty50 are likely to start Tuesday's session lower amid mixed moves in their major peers around the globe, as investors remained concerned about a growing unrest in China over COVID-related restrictions. Singapore Exchange (SGX) Nifty futures — an early indicator of the Nifty index — fell as much as 111.5 points or 0.6 percent to 18,617.5, suggesting a lower opening ahead on Dalal Street.