Domestic equity markets opened on a cautious note on Tuesday following mixed global cues. The BSE Sensex opened 20.77 points, or 0.06 per cent up, at 32,654, while NSE Nifty index opened 3.20 points, or 0.03 per cent, down at 10,227.65.Sensex, Nifty start on a cautious note; all eyes on Wipro, Axis Bank