Despite a strong start against the backdrop of firm Asian cues, market turned highly volatile during the last hour and succumbed to profit-booking as investors turned cautious.
"Markets remained lacklustre as investors preferred to stay sidelines ahead of Greece outcome. Tough RBI governor statement -- India's exposure to the Greece is limited -- tried to cheer the street but indices shed the gains in last leg of trade," said Gaurav Jain, Director at Hem Securities.
However, on across-the-board selling towards the close, the Sensex slipped into negative zone and closed the session 75.07 points or 0.27 per cent down at 27,945.80, slipping from its two-and-a-half months high.
The gauge had gained 376 points in previous two sessions.
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"We saw a mild pause to the out performance of the Indian market, especially to front stocks and indexes. But the undercurrent continues to be strong with a rally in the mid-caps," said Vinod Nair, Head of Fundamental Research at Geojit BNP Paribas Financial Services.
Tata Motors fell the most among Sensex stocks by dropping 1.84 per cent despite the firm reported a 6 per cent increase in total sales in June, followed by Hindalco at 1.72 per cent.
Stocks of software exporters also faced selling after revenue warnings by some IT firms and Eurozone worries led to concern about June-quarter earnings.