Indian equity benchmarks BSE Sensex and NSE Nifty50 are likely to start Tuesday's session lower amid mixed moves across global markets ahead of a key rate decision by the Fed due this week. Singapore Exchange (SGX) Nifty futures — an early indicator of the Nifty index — fell as much as 61.5 points or 0.4 percent to 16,557, suggesting a weak opening ahead on Dalal Street. Investors awaited more of corporate earnings from India Inc for cues, with Asian Paints and Bajaj Auto due to report their numbers later in the day.