The Sensex and Nifty opened flat on Tuesday amid caution ahead of key Q2 earnings. The Sensex slipped 123 points to 83,855, while the Nifty fell 53 points to 25,710. Experts said FII selling worth ₹14,269 crore in recent days is weighing on sentiment. However, strong GDP growth and PSU bank resilience keep long-term outlook positive.