Indian benchmark indices BSE Sensex and NSE's Nifty50 are likely to open little changed on Tuesday, tracking muted trends in global markets. Asian shares traded mixed after disappointing PMI data. Meanwhile, US stocks hit record highs in the previous session following progress in US-China trade negotiations. Indian markets have turned cautious ahead of the Union Budget to be presented in the Parliament on July 5. At 7.00 AM, the SGX Nifty futures traded 9 points, or 0.08 percent, higher indicating a flat start for the Nifty 50 and the Sensex.