Shane Watson took five wickets in a Test innings for the first time as Australia edged ahead in their series opener with Pakistan at Lord's in London on Wednesday.
Medium-pacer Watson's return of five wickets for 40 runs helped Australia dismiss a largely inexperienced Pakistan side for just 148 in reply to their first innings 253.
That gave Australia a lead of 105, and come stumps on the second day of this two-Test series, they were 100 for four - an overall advantage of 205.
Umar Gul took two wickets in two balls late on with Michael Clarke, not for the first time, bowled playing no stroke.
Then Michael Hussey, who made an unbeaten 56 in the first innings, was caught by Imran Farhat at first slip off the seamer, who took two for seven in five overs.
But left-handed opener Simon Katich, who made a painstaking 80 yesterday, was 49 not out and Mitchell Johnson, in as nightwatchman ahead of Marcus North, two not out.
And unless Pakistan bat significantly better in their second innings, Australia could already have enough runs on the board.
Opener Watson's batting didn't quite match his bowling when he was caught by Farhat off Mohammad Asif for 31.
And Australia captain Ricky Ponting -- who has never made a Test century at Lord's -- was lbw for nought padding up to Asif's inswinger in what could be the 35-year-old batting great's last innings at the ground.
Watson, in his 19th Test, surpassed his previous best figures of four for 42 against India in Nagpur in 2008, when he had Danish Kaneria caught in the slips by Steven Smith.
The 29-year-old Queenslander became the first bowler to win a place on the newly-created honours board for 'neutral' Tests at Lord's.
Australia's batsmen had struggled under overcast, swing bowler-friendly, skies yesterday.
But similar conditions proved even tougher for Pakistan to handle, with Watson taking two wickets for no runs in four balls.
Only left-handed opener Salman Butt resisted with a determined 63 before Pakistan's vice-captain was bowled by a Watson inswinger.
New-ball duo Ben Hilfenhaus took two for 38 and Doug Bollinger two for 37 as Australia chased a 13th straight Test win over Pakistan -- which would be a new record for successive Tests victories by one country over another.
Pakistan captain Shahid Afridi, playing his first Test for four years, took guard with his team in dire straits at 83 for five.
New Pakistan captain Shahid Afridi, scorer of the fastest century in one-day cricket and playing his first test for four years, opted to bring Twenty20 cricket to the test arena.
He lofted Watson over the mid-wicket boundary and mid-off for two sixes in an innings of 31 from only 15 balls including four boundaries. After transforming Watson's figures from two for nought to two for 30 Afridi was caught at mid-off by Mitchell Johnson trying another big hit.