Australia is in the commanding position of the fourth Test of Ashes 2019, and the credit goes to Steve Smith for a brilliant double hundred.

Smith played a 211-run innings which took Australia to a total of 497 runs. At one stage, the visitors were struggling at 224/5. But the partnership between Smith and skipper Tim Paine of 125 runs took Australia ahead in the game.

Smith has played a dominant role in Australia's domination in this Test or even the series. But former India cricketer Sachin Tendulkar feels it's Nathan Lyon who is going to be the significant contributor for the visitors.

"My instincts say that Nathan Lyon is going to be the key player for Australia in the remaining part of this Test," Sachin tweeted.

England are currently one down on 23 runs at the end of second day's play.