Benchmark shares indices opened lower in early trades on Monday, amid a weakening rupee, with financials leading the decline.The Rupee breached the 63 mark for the first time sinve September 30 in early trades today and was trading at Rs 63At 9:16AM, the 30-share Sensex was down 126 points at 20,540 and the 50-share Nifty was down 39 points at 6,101.