New Delhi, Sept. 15 -- Indian stock markets opened almost flat in green on Monday as investors remained cautious ahead of several key monetary policy decisions scheduled this week by global central banks.

The Nifty 50 index opened at 25,118.90, registering a marginal gain of 4.90 points or 0.02 per cent. The BSE Sensex also moved slightly higher, opening at 81,925.51 with a gain of 20.81 points or 0.03 per cent.

Market experts noted that this week is crucial as 16 central banks are lined up for policy meetings, including the US Federal Reserve.

Ajay Bagga, banking and market expert, told ANI, "Very heavy week for monetary policy actions, with 16 central banks meeting in an environment of geopolitical tensions and policy chaos along wit...