MELBOURNE (AGENCIES) Chasing a daunting target of 422 runs, Pakistan reached 170 for three at stumps on day-four of the first Test against Australia on Yousuf, Umar Akmal keep Pakistans hopes alive Tuesday. Captain Mohammad Yousuf (45) and Umar Akmal (27) were at the crease. The two batsmen hold the key for Pakistan if it wants to challenge the Kangaroos, but it would require a mammoth effort from both the batsmen to chase down the gigantic total to take a 1-0 lead in the three match series. Needing 252 more runs on the final day, Pakistan could create history by chasing down the highest total in a Test match, but given the recent form of the Pakistani middle-order it will surely require either Yousuf or young Akmal to rise to the occasion. Pakistan started awfully in the second innings with the left-arm quick duo of Doug Bollinger and Mitchell Johnson removing the both openers with great in-swinging deliveries. But it was off-spinner Nathan Hauritz who dealt the visitors a bigger blow by removing Faisal Iqbal for 48 with an hour to play, Fox Sports reports. Earlier in the day, all-rounder Shane Watson achieved his long standing dream of hitting a Test match century, but not before offering the Pakistani fielders a chance which they refused to hold on to. Watson was dropped on 99 Abdur Rauf at square gully of the bowling of Mohammad Aamer. Aamer bowled splendidly through the Australian second innings, especially in the first hour of the day, and removed Michael Clarke (37), Marcus North (8) and Brad Haddin, for a second-ball duck. SCOREBOARD AUSTRALIA, first innings: 454/5 decl. PAKISTAN, first innings: 258 all out AUSTRALIA, second innings: SR Watson not out 120 SM Katich c Kamran Akmal b Asif 2 RT Ponting c Butt b Aamer 12 MEK Hussey lbw b Aamer 4 MJ Clarke c Kamran Akmal b Aamer 37 MJ North b Aamer 8 BJ Haddin c Kamran Akmal b Aamer 0 MG Johnson run out (Asif/ Ajmal) 22 NM Hauritz st Kamran Akmal b Ajmal 8 EXTRAS: (lb 2, w 3, nb 7) 12 TOTAL: (8 wickets dec; 73.1 overs) 225 Did not bat: DE Bollinger, PM Siddle Fall of wickets: 1-15, 2-32, 3-40, 4-143, 5-161, 6-161, 7-198, 8-225 BOWLING: M Asif 16-3-38-1(2w) M Aamer 24-6-79-5(6nb, 1w) Saeed Ajmal 23.1-1-73-1 Abdur Rauf 10-3-33-0-3 PAKISTAN: (target: 422 runs) Imran Farhat lbw b Bollinger 12 Salman Butt lbw b Johnson 33 Faisal Iqbal b Hauritz 48 Mohammad Yousuf not out 45 Umar Akmal not out 27 EXTRAS: (b 1, lb 1, w 1, nb 2) 5 TOTAL: (3 wickets; 45 overs) 170 Fall of wickets: 1-18, 2-80, 3-116 BOWLING: DE Bollinger 10-3-31-1 PM Siddle 8-3-26-0 NM Hauritz 15-2-62-1(2nb) MG Johnson 10-2-36-1(1w) SM Katich 2-0-13-0 Toss: Australia Umpires: BR Doctrove (West Indies) and RE Koertzen (South Africa) TV umpire: EAR de Silva (Sri Lanka) Match referee: RS Madugalle (Sri Lanka) A glance at fourth day's play Pakistan fight their way back NABEEL SABIR After a poor batting display in the first innings, Pakistan team fought back hard both with bat and ball to give them a fair chance of winning this Test now. After a solid display on day-four, a world record beckons for Pakistan on day-five if they manage to go all the way and win this Test. Australia started day-four in command with a lead in excess of 300. But Pakistan bowlers gave a spirited show and bowl well to restrict the Australians. Mohammad Aamer continued with his inspired spell of fast bowling removing Michael Clarke for his first wicket of the day. Aamer continued his fine spell and soon removed Marcus North and Brad Haddin in space of two deliveries which left Australia reeling at 161-6. Aamer became the youngest fast bowler in Test history to achieve a five wicket haul as Aussies looked clueless against his speed and accuracy. Aamer could also had the wicket of Shane Watson but the catch was dropped allowing Watson to complete his maiden Test hundred. His ton came off 186 balls and included nine fours and a six giving Australian command in this Test. Aamer finished with five for 79 from 24 overs as Australia declared on 225-8 midway through the second session with Watson unbeaten on 120. This left Pakistan a world record 422 runs for victory. Pakistans pursuit was far from ideal when Imran Farhat fell to Doug Bollinger for 12. A 62 runs stand for the second wicket between Salman Butt and Faisal Iqbal followed but Mitchell Johnson struck to remove Butt for 33. Faisal was beginning to look good but fell at the wrong time for Pakistan when he was bowled for 48 by Nathan Hauritz. Umar Akmal joined skipper Mohammad Yousuf and the two added 54 unbeaten runs for the fourth wicket as Pakistan ended the day at 170-3. Yousuf is batting on 45 while Umar has contributed 27 with Pakistan needing 252 further for a historic victory. Yousuf will hold the key and will have to play a captains innings if Pakistan are to chase down this target. Umar Akmal has been impressive but is impetuous at times which he needs to curtail on the final day. Misbah-ul-Haq and Kamran Akmal are to come both who can bat and are in good form. However, it will all depend on how Yousuf and Umar negotiate the first hour or so on day five. Australians have had difficulty bowling out side in the fourth innings in recent times - a case in point being South Africas fourth innings successful chase of 414 last year at Perth. Still the Australia will be at them throughout and it wont be easy. Pitch still doesnt have any tremors in it and if Pakistanis apply themselves they are in with a real chance.