The benchmark indices - Sensex and Nifty are likely to open in green today, taking a cue from SGX Nifty. The 30-share BSE Sensex fell 128.90 points or 0.21 per cent to close at 61,431.74 on Monday. During the day, it climbed 395.26 points to 61,955.90. The NSE Nifty finished the expiry day session with a cut of 51.80 points or 0.28 per cent at 18,129.95.