The 30-share BSE index was trading 36.88 points or 0.07 per cent lower at 52,445.83 in initial deals. Similarly, the broader NSE Nifty inched 5.50 points or 0.03 per cent down to 15,716.
At the interbank foreign exchange, the rupee opened lower at 74.18 against the dollar, then fell further to 74.20, registering a fall of 10 paise over its previous close.
The 30-share BSE index was trading 302.80 points or 0.58 per cent lower at 52,199.18 in initial deals. Similarly, the broader NSE Nifty declined 93.70 points or 0.59 per cent to 15,673.85.
In the previous session, Sensex surged 376.60 points or 0.94 per cent to finish at 40,522.10, while Nifty climbed 121.65 points or 1.03 per cent to 11,889.40.