Sundar gets the leading edge as he tries to clip Starc off his pads. He square drives the next ball past point for three runs and Reddy picks a single on the off-side.
Sundar plays another sweetly-timed flick through midwicket but the ball still doesn't reach the boundary. However, the two young batters do well to sprint across for four runs.
The runs have come quite freely against the new ball with 22 coming from five overs with the second new ball.
Cummins concedes just a single to Reddy in his 25th over.
The eighth wicket partnership is now worth 63 runs as India inch towards 300.