Smith said he smashed it - Renshaw

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Australia captain Steve Smith admitted he "smashed" Pakistan paceman Mohammad Amir through to wicketkeeper Sarfraz Ahmed before going on to make a century on day one of the first Test.

Smith was unbeaten on 97 at the Gabba on Thursday when Amir produced a beautiful delivery that ended up in the gloves of Sarfraz, but there was no appeal from the tourists.

Replays showed Smith had got a faint edge, having already been dropped soon after bringing up his half-century on a frustrating day for Pakistan, which saw Australia close on 288-3.

Smith was unbeaten on 110 at the close along with Peter Handscomb (64 not out) and there was a maiden Test half-century for Matt Renshaw (71) on his home ground.

Young opener Renshaw, playing his second Test, revealed that Smith had come clean that Amir should have denied him a 16th Test ton.

"I walked into the dressing room quickly and he was saying he smashed it," Renshaw said.

"It was all good fun though I guess."

Pakistan will not see the funny side after a testing first day of the three-match series, with 20-year-old Renshaw showing plenty of promise at the top of the order.

Renshaw said: "I just went out there and batted and got a few balls in my areas and tried to put them away. Fortunately they went to the boundary.

"I was a little bit more nervous this morning than I thought I would be. But as soon as I walked onto the ground and heard the anthems I was more excited than nervous really."