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Adelaide: Usman Khawaja posted the most important century of his cricket career to help Australia's new-look lineup to a 48-run lead against South Africa on the second day Friday of the day-night test.
His unbeaten 138 from 285 balls was Australia's first century of the series, and gave the hosts the daily honors for the first time since the opening day of the three-test series.
The South Africans clinched the series after big wins in Perth and Hobart and are playing a test with the pink ball for the first time.
After resuming at 0-14 on day two, Australia reached 6-307 at stumps.
Kyle Abbott (3-38) took three of the first four wickets for South Africa and Kagiso Rabada and Vernon Philander chipped in with late wickets by getting the second new ball to seam and swing under the lights.
Khawaja was forced into the unaccustomed role of opener when South Africa skipper Faf du Plessis's tactical declaration at 9 for 259 late on the opening night meant David Warner was not allowed to bat, and he worked with all three new batsmen in the top order.
He batted all day and his only real blemish was the mix up that led to the run out of his skipper Steve Smith for 59, ending their 137-run stand for the third wicket.
Khawaja also shared a 99-run partnership with debutant Peter Handscomb (54) in the second of two stands that lifted Australia from 2 for 37 to four for 273.
He survived 12 overs under lights before stumps on the first night with 20-year-old newcomer Matt Renshaw (10), who was out first on Friday, superbly caught by a diving Dean Elgar at third slip off Abbott's bowling. Warner (11) was dismissed by the same combination.
Brief scores
South Africa - 9 for 259 dec (du Plessis 118*, Hazlewood 4-36)
Australia - 6 for 307 (Khawaja 138*, Smith 59, Handscomb 54, Abbott 3-38)
Status - Australia lead by 48 runs
