Sundar flicks Starc through midwicket for a single on the leg side and Reddy doesn't want to chase the wide deliveries, especially so close to his century.
Four leaves in a row before Star comes closer to the stumps and Reddy defends it on the off-side.
Spinner Nathan Lyon back into the attack in place of Marsh. Sundar punches the short wide delivery in the gap through the covers for three runs.
Reddy clips Lyon with the spin to deep square leg for one and Sundar takes one off the next.
A single off the last ball takes Reddy's score to 89 -- the highest score by an Indian batting at No 8 or below in Tests in Australia beating the previous record held by Anil Kumble, who made 87 in the Adelaide Test in 2008.
Boland comes back into the attack. He gets the back of length delivery to swing in sharply into Reddy, to strike him high above the pads and he blocks the last ball.