Australia have South Africa by the throat at Newlands, held the world Test champions to a desperate 140/4 at stumps on day three, just 40 runs ahead with six wickets standing between them and a series defeat on home soil. What should be a fortress has become a trap, and the Proteas are running out of escape routes.

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Josh Inglis, who earlier compiled a composed 102 to anchor Australia’s 429 all out, singled out Nathan Lyon’s dismissal of South African captain Temba Bavuma in the penultimate over as the dagger twist that left the hosts reeling.

Bavuma had grafted for almost three hours, grinding out 35 in typical rearguard fashion, before attempting to whip Lyon through midwicket. The ball spun viciously, evading the bat and clattering into the stumps. Cue pandemonium amongst the Australian fielders and deathly silence from the home faithful.

“It’s really satisfying,” Inglis said, savouring the moment. “I think we controlled the tempo really well in that last session. Although they were playing well, they weren’t really getting away from us. I thought Gaz bowled brilliantly and looked threatening the whole time. When you work for a couple of hours and get the rewards right at the end, it’s really satisfying.”

That final session told the story, South Africa managed just 87 runs from 34 overs as Australia applied a stranglehold that grew tighter with every dot ball. The Proteas batsmen weren’t collapsing, but they weren’t escaping either, and in Test cricket, that slow suffocation can prove fatal.

Spin set to dominate

South African off-spinner Simon Harmer, who toiled through 37 overs to claim four for 104 in Australia’s second innings, admitted spin is poised to play an increasingly decisive role as the pitch deteriorates.

“If you look at how the wicket changed from this morning to this evening, it’s been quite a dramatic change,” Harmer observed. “I think Mitchell Starc does a pretty good job of churning up the wicket with footmarks from his follow-through as a left-arm bowler. So yeah, I definitely think that spin is probably going to come into it a lot more than it has in the first two-and-a-half days.”

Harmer cautioned his teammates against looking too far ahead in terms of posting a defendable total. “We can’t afford to think that way,” he said.

Fast bowlers set the tone

Lyon had to wait until late in the day for his reward, but it was the pace duo of Starc and Josh Hazlewood who softened South Africa up with early strikes.

Starc, who ripped through the Proteas with six for 72 in the first innings, continued his love affair with Newlands by dismissing Aiden Markram and Marques Ackerman. Hazlewood chipped in with David Bedingham’s wicket, the right-hander falling hooking for the second time in the match, a technical flaw Australia exploited ruthlessly.

Lyon bowled 14 overs for just 31 runs, finishing with one wicket but posing a constant threat. His control, coupled with the deteriorating surface, suggests he could wreak havoc if South Africa bat deep into day four.

Inglis seizes unexpected opportunity

Inglis’ century earlier in the day provided the platform for Australia’s dominance. The 29-year-old reached three figures before Australia were bowled out for 429, having resumed on 330/4.

In a delicious twist, Inglis revealed he only discovered he was playing on the morning of the match when Steve Smith ruled himself out with a neck injury. Talk about seizing your moment.

“I only found out I was playing when Steve withdrew,” Inglis admitted. No pressure then, just step in for one of the world’s best batsmen in a series decider and deliver a match-defining century. No big deal.

Australia now have South Africa exactly where they want them. The pitch is crumbling, Lyon is licking his lips, and the Proteas need a miracle to avoid going 2-1 down in a series they once controlled.

Day four promises to be brutal. For South Africa, survival is no longer optional, it’s essential.