Mumbai: The BSE benchmark Sensex fell by over 68 points in opening trade on Monday as realty, banking and oil and gas stocks succumbed to profit-booking in the wake of Friday's rally.

The 30-share Sensex, which has gained over 1,016 points in the past four sessions, fell by 68.65 points, or 0.39 percent, to 17,736.15 in opening trade on Monday.

In a similar fashion, the wide-based National Stock Exchange Nifty Index shed 23.10 points, or 0.43 percent, to 5,337.60.

Brokers said apart from profit-booking by market participants, a nearly 60 percent dip in the Q2 net profit of the country's largest car-maker, Maruti Suzuki India, dampened the trading sentiment.

Stocks of Maruti Suzuki India fell by 4.59 percent to Rs 1,098.80 in early trade.

Meanwhile, in the Asia region, Hong Kong's Hang Seng Index was down 1.14 percent, while Japan's Nikkei edged lower by 0.03 percent in morning trade on Monday.