New Delhi, July 22 -- Indian stock markets extended gains on Tuesday's opening session, following a strong close on Monday and buoyed by record highs in U.S. indices.

Investors remained optimistic despite ongoing foreign portfolio investor (FPI) selling, as banking stocks continued to support the market.

The Nifty 50 index opened at 25,166.65, gaining 75.95 points or 0.30 per cent, while the BSE Sensex began the day at 82,527.43, rising 327.09 points or 0.40 per cent.

Experts noted that investor sentiment has turned positive amid strong cues from the US, where both the S&P 500 and Nasdaq hit fresh highs.

Ajay Bagga, a banking and market expert, told ANI, "India is seeing continued FPI selling but we saw banks doing the heavy lifting y...