Mumbai, May 9 -- The Indian rupee is seen extending downside against the dollar on opening trades on Friday tracking renewed gains in dollar overseas and rising geo-political cross border tensions. INR opened at Rs 85.88 per dollar but recovered to a high of 85.72 so far during the day. Yesterday rupee depreciated sharply by around 80 paise to close at 85.58 against the US dollar, weighed down by heightened geopolitical tensions between India and Pakistan. Domestic shares closed the session lower as growing concerns over escalating India-Pakistan tensions curbed investors' appetite for risk. The benchmark 30-share BSE Sensex fell 411.97 points, or 0.51 percent, to 80,334.81 while the broader NSE Nifty index closed down 140.60 points, or 0.5...