Indian shares are likely to open on a cautious note on Tuesday in line with global markets as investors await US-China trade talks at the G20 meeting later this week.Rising geopolitical tensions between the US and Iran has also made investor cautious. US President Donald Trump on Monday targeted Iranian Supreme Leader Ayatollah Ali Khamenei and other top Iranian officials with sanctions.Indian benchmark indices BSE Sensex and NSE’s Nifty 50 ended marginally lower in the previous session dragged by metal and auto stocks. The BSE Sensex fell 71.53 points, or 0.18 percent, to 39,122.96, and the Nifty 50 declined 24.45 points, or 0.21 percent, to 11,699.65.At 7.35 AM, SGX Nifty an early indicator of the Nifty 50's trend in India, traded 12 points, or 0.10 percent, higher at 11,728, pointing to a muted start for the Sensex and the Nifty 50.Stocks to watch: TCS, SBI Life, Piramal, Axis Bank in focus. Click here to know more. About MarketBuzzThe CNBCTV18.com podcast on the big themes, vital news and key events that you should know before the opening bell, powered by CNBC-TV18 anchors.MarketBuzz is your daily morning briefing by CNBC-TV18 research analysts and anchors Sonia Shenoy, Ekta Batra, Anisha Jain, Nigel D’Souza and Mangalam Maloo to jumpstart your stock market investing.Subscribe to our free podcasts on Audioboom or listen on the featured podcast page on CNBCTV18.com.