Khawaja and Smith steadied the ship batting through the second session.
Joe Root continued with his purple patch during the first Ashes Test against Australia at Edgbaston, bringing up his 30th Test century.
Imam-ul-Haq hit a memorable first Test century on Friday and led Pakistan to a commanding 245-1 in its first home Test against Aus in 24 years
'It was a surreal experience to represent the country. Thanks to everyone for your wishes. Looking forward for more challenges.'
Labuschagne has regained the No. 1 position after Root overtook him in mid-June with successive centuries against New Zealand.
Australia, who won the toss and batted in the day-nighter, reached 248 for four at stumps with Labuschagne 110 not out and Travis Head unbeaten on 20.
Concerns that senior players would pull out of the tour due to security issues after both England and New Zealand withdrew from tours of Pakistan late last year have proven unfounded.
Travis Head and Marnus Labuschagne missed individual centuries but forged Australia's highest partnership of the summer to earn the hosts a handy first innings lead against Sri Lanka on day two of the series opening day-night Test on Friday.
Images from Day 3 of the fourth and final Test between India and Australia at the Narendra Modi Stadium in Ahmedabad, on Saturday.
Australia batting mainstay Steve Smith says he was looking to put Ravichandran Ashwin under pressure while batting on the opening day of the third Test in Sydney.
The DRS system needs to be thoroughly looked into by the @ICC, especially for the 'Umpires Call'," Tendulkar tweeted on Monday.
Ashwin picked Smith's wicket in the first session of the Boxing Day Test on Saturday for a duck.
With Kane Williamson likely to miss the Test, New Zealand will have a lot of work to do in the 3rd Test in Sydney.
Kohli gained two points for his half-century to get to 888 while Smith (911) lost 10 points in the table after scoring 1 and 1 in his two innings.
The 34-year-old took the prized wickets of Imam-ul-Haq, Azhar Ali and Babar Azam to end Pakistan's resistance and finished with figures of 5-83 in Pakistan's second innings.
India have already secured the Border-Gavaskar trophy and they will now be playing for a record-extending 16th straight series win at home
Australia came into the match better prepared and executed their plans to perfection while the Indians hit the panic button once the toss went against them.
Australia captain Aaron Finch says playing in the sub-continent can be intimidating, but having won an ODI series last year, he says 'Knowing that our game plan is good enough to beat India in India, that gives us a lot of confidence going there.'
The Aaron Finch-led Australia side has moved to the top of the ICC Men's Cricket World Cup Super League points table following their 2-1 ODI series victory over India.
Steve Smith has revealed that he suffered a 'bad dose of vertigo' ahead of the second One-dayer against India
Pakistani bowlers failed to put pressure on the hosts and failed to pick wickets.
IMAGES from the 1st Test played between Australia and New Zealand in Melbourne on Thursday
Team India possess a much more balanced squad in the shortest format.
Pace spearhead Jasprit Bumrah found his mojo as India got back to winning ways with a morale-lifting 13-run triumph over Australia in the third and final ODI in Canberra on Wednesday, salvaging some of the lost pride in a 1-2 series defeat.
Images from the opening day of the second Test between Australia and Pakistan at the Adelaide Oval on Friday.
Sri Lanka fined 40 percent of match fee for slow-over rate in second T20 against Australia
The spinner could not justify his selection and leaked 95 from his 11 overs for the wicket of Marnus Labuschagne.
'In terms of a great first year, it was an amazing summer and hopefully, I can better that this time... Hopefully, against a side like India, testing yourself against one of the best bowling attacks in world cricket at the moment'
In the longest format of the game, Babar is ranked fifth in the world, behind Australia's Marnus Labuschagne and the 'Big Four' of India's Virat Kohli, England's Joe Root, Australia's Steve Smith and New Zealand's Kane Williamson.
Dinesh Chandimal smashed a maiden double hundred and Prabath Jayasuriya claimed 12 wickets in a dream debut to script Sri Lanka's series-levelling victory by an innings and 39 runs in the second Test against Australia in Galle on Monday.
England all-rounder Ben Stokes was named the 'Leading Cricketer in the World' in the 2020 edition of the Wisden Cricketers' Almanack, the publication said on Wednesday. The 28-year-old played a leading role in England's 50-over World Cup victory at home last year while his brilliant unbeaten knock of 135 helped the side to a thrilling one-wicket win over Australia in the third Ashes Test at Headingley.
Pujara scored an unbeaten 130 as India finished day one at 303 for four.
Former Australia captain Ricky Ponting was critical of Pujara's strike rate during the third Test in Sydney but the Test specialist was unmoved.
Matthew Wade's defiant century proved in vain as England bowled Australia out for 263 to win the final Test at The Oval by 135 runs on Sunday and ensure the first drawn Ashes series since 1972.
'It hasn't been easy for the batters throughout the series'
Australia coach Justin Langer has urged the struggling batsmen in his team to step up and deliver when the fifth and final Ashes Test against England starts at The Oval on Thursday.
'When you don't score runs in India, obviously you will get flak. KL Rahul hasn't been the only one'
Steve Smith continued his outstanding Ashes form, striking an unbeaten 60 as Australia recovered from another failure by their openers to reach 170-3 at the close of the rain-affected first day of the fourth Test against England.
Azhar Ali hit his fourth Test ton against Australia as Pakistan piled on 476-4 before declaring
Ishan Kishan has made a massive jump to enter the top 10 among T20 batters.
