The 16-year-old averaged 146km/h in his highly anticipated first over and reached 148.1km/h in his fourth after coming on at first change.

Naseem returned for a two-over burst before lunch to smack opener Joe Burns on the arm and send him to the floor.

Burns (41 not out) didn't receive any treatment and saw off the final ball of the session before confidently walking back the dressing room for lunch alongside David Warner (52 not out).

It continued Naseem eventful tour after becoming the youngest player to make a Test debut in Australia.

The tearaway quick, on the back of seven first-class games, has been compared to Dennis Lillee and was in tears when accepting his cap from Waqar Younis.

But it was with the bat that he first made a contribution, seeing off a Mitchell Starc hat-trick ball in theatrical fashion.

A nervous, awkward prod hit the inside edge and somehow missed the stumps to ensure no hat-trick and he was almost run-out when batting partner Asad Shafiq sent him scrambling back into his crease.

His debut comes a week after his mother's death, something Pakistan bowling great and new assistant coach Waqar Younis says he's grappled with well.

"The last week or so, it's been really tough on him and all we did was give him a soothing hug, kept our arms around him," Waqar said on Fox Cricket.

"We wanted to send him back for the funeral but his family, his brothers said you can't really make it in time, so stay back (in Australia).

"Since then he's been really strong actually, so I'm looking really forward for him to run in and bowl some good deliveries."

Pakistan controversially omitted proven performer Mohammad Abbas despite his 17 wickets at 10.58 when the two teams met in the UAE last year.

Instead the tourists have backed Naseem, 19-year-old Shaheen Afridi and in-form Imran Khan, alongside leg-spinner Yasir Shah.

Australian Associated Press