New Delhi, May 27 -- Sensex and Nifty 50, the Indian stock market benchmark indices, are estimated to see a flat opening on Tuesday, following mixed global market cues. The trends in Gift Nifty also signal a muted opening for the market.

The domestic equity market witnessed strong gains on Monday, and the benchmark Nifty 50 closed at the 25,000 level.

The Sensex closed 455.37 points, or 0.56%, higher at 82,176.45, while the Nifty 50 ended up 148.00 points, or 0.60%, at 25,001.15.

On the Nifty options front, Chandan Taparia, Head - Derivatives and Technicals, Wealth Management, MOFSL, noted that the maximum Call OI (Open Interest) is at 26,000 then 25,000 strike while maximum Put OI is at 24,000 then 24,500 strike.

"Call writing is see...