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Australia's Marnus Labuschagne was a concussion substitute for Steve Smith at Lord's in August - now he's leading from the front with back-to-back Test hundreds.

He relives the moment that Australia captain Tim Paine told him he was up to replace Steve Smith and what effect that moment has had on his career.

Labuschagne also explains what it feels like to be hit on the helmet by England fast bowler Jofra Archer.

Photo: Marnus Labuschagne of Australia celebrates scoring a century (Getty Images)