Usman Khawaja and David Warner struck unbeaten half-centuries to drive Australia’s strong reply to Pakistan’s first innings total of 476 for four declared on day three of the opening test on Sunday. The tourists were 138 for no loss at the lunch break, still 338 behind but they scored at 4.18 runs per over, which is significantly better than Pakistan’s under-three run rate. Islamabad-born Khawaja was batting on 70 at the break, while Warner was on 60 with the openers having hit a combined 23 boundaries. Earlier after Australia resumed on five for no loss, Warner looked in discomfort against Sh…