Starc clips Reddy to deep square leg for a single to bring up Australia's 100, in the 46th over.
They were reduced to 79/9 at one but Starc and Hazlewood have applied themselves to take their team past the 100 mark.
They still trail India by 50 runs. Any lead will be handy on this Perth pitch, which is still very difficult for batting.
Hazlewood is beaten by Reddy on the outside edge before he guides the last ball to thirdman but Starc doesn't want the single.
Starc again showing great presence of mind to pick a single off Siraj's fourth ball, while Hazlewood keeps out the last two balls.