PERTH, AAP - Usman Khawaja and Tim Paine have increased Australia's lead to 233 runs in the second Test against India, negotiating a wicket-less morning session on day four as Virat Kohli's frustrations bubbled to the surface again.
Australia reached 4-190 at lunch in Perth on Monday, when Aaron Finch was cleared to continue his innings after retiring hurt because of a finger injury.
Tempers flared as Kohli attempted to needle counterpart Paine while pressing for a breakthrough, continuing the slanging match they started late on day three.
Umpire Chris Gaffaney asked both captains to "play the game" after one spat, while umpire Kumar Dharmasena also spoke with both men during a tense finish to the session.
"Keep your cool Virat," Paine quipped.
Kohli stationed himself in the path of Paine at one point when the batsman was running between the wickets, with the pair making slight contact when they were chest to chest.
Both skippers grinned after the incident.
Khawaja is 67 not out, producing his first score of substance in the series to boost Australia's hopes of a series-levelling victory at Optus Stadium.
Khawaja took off for a quick single on 42 and would have been found short of his ground by a direct hit from Jasprit Bumrah, but otherwise was a picture of composure despite some challenging spells of fast bowling.
Paine is 37 not out, with the unbeaten partnership already worth 70 runs.
Australia scored just 19 runs in the opening hour of play on day four but denied India a wicket that could have sparked a Test-deciding collapse.
Finch was sent for scans after being struck on the right glove by a rearing Mohammed Shami delivery on Sunday but has batted in the nets and is expected to resume his innings at the fall of a wicket.
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