Post a gap-up opening on Monday, Nifty Futures was unable to sustain early gains as all advances faded in the second half of the session, leading to a volatile session within a 192-point range. Finally, the index ended flat, with the downtrend still evident on the daily chart as selling pressure persisted. Meanwhile, Bank Nifty Futures also remained volatile, witnessing sharp swings of 564 points during the day.