But Smith settled himself and shrugged off the early nerves while Warner played what is already one of his best - if not the best - knock in such conditions.
The 30-year-old was of the opinion that the Australians have realised that the Bangladeshi players are also aggressive and revealed that there were some fiery words between the sides, reflecting the confidence of the Bangladesh team.
Taijul Islam's 3-60 and Mehedi Hasan's 2-80 helped Bangladesh a lot to make the apparently hard match easy for the Tigers.
Australia skipper Steve Smith was among those bemused by Shakib's pre-series assertions that a modest Bangladesh were capable of beating Australia 2-0 in the home series.
"We let ourselves down a bit in the first innings with the bat", Smith said. But in this match the wicket was very tough to bat.
'Dangerous' Heat Wave Brings Soaring Temperatures, Elevated Fire Danger to Southern California
The high today for Fallbrook is expected to hit 89 degrees, but by Tuesday, highs are predicted to hit triple digits. On Tuesday, San Diego is forecasted to hit 91 degrees, which would break the previous August 29 record of 88.
He is the third Australian paceman to be sidelined less than three months before the Ashes series against England, with Mitchell Starc and James Pattinson also injured. Still, we knew the pitch was helping the spinners and apart from the two batsmen [overnight batsmen Steve Smith and David Warner] they didn't have the experience to survive. I couldn't believe that we can win today's match.
"Smithy and Dave look like they had really good game plans out there and they were in control".
On a turning track where their frontline batsmen have struggled against Bangladesh's three-pronged spin attack, Peter Handscomb, Matthew Wade and Ashton Agar all fell in quick succession prior to lunch.
Home captain Mushfiqur Rahim warned Australia that an increasingly confident Bangladesh would be going all out for what would be a sensational series triumph after securing a maiden test victory over the tourists on Wednesday.
The left-arm spinner then snuffed out whatever realistic hopes Australia had of making it five straight wins over Bangladesh by dismissing Glenn Maxwell with the first delivery after lunch break.
"I thought we did pretty well to be fair to get (244) on this wicket in the second innings".