Adam Scott has stormed to a share of the clubhouse lead with a brilliant second-round seven-under-par 65 at the Australian Open in Sydney.Steaming after opening with a disappointing 73, Scott took his frustrations out on Royal Sydney on Friday, rattling in seven birdies and an eagle on the 513-metre par-5 seventh.Veteran Rod Pampling continued his excellent form with a 66 to join Scott on top at six under for the championship.Fresh from hitting a $1.5 million jackpot in Las Vegas with his first win in America in a decade, Pampling was less spectacular with five birdies but steadier than Scott, who blotched his colourful scorecard with two bogeys.The cream certainly rose to the top on Friday, with fellow US PGA Tour stars Jhonattan Vegas and two-time Open champion Aaron Baddeley also making big moves.Vegass 66 vaulted him to equal third in the clubhouse at five under alongside first-round co-leaders Lucas Herbert and Curtis Luck, who had afternoon tee-offs.Baddeley followed up his first-round 74 with a sizzling 66 of his own to climb to four under overall in his quest to lift the Stonehaven Cup for a third time - and second time at Royal Sydney, having reigned as a teenaged amateur in 1999.Scotts morning-best 65 could have been even better if not for a slow start.He missed successive six-foot birdie attempts on his first two holes, then compounded his woes with a bogey on the third to briefly slip back to two over.But he was on his way after draining back-to-back 15-foot putts for birdies on his fourth and fifth holes.Two-time champion Peter Senior created headlines of his own on Friday but for vastly different reasons.The 57-year-old hobbled off the course with chronic hip pain six holes into his second round and immediately announced his retirement from golf.Its just horrendous, Senior said.I cant hit a golf shot out there. 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Hes been questioned from the start of his AFL career right up to his 200th game, but Sydney co-captain Kieren Jack has invariably found the right answers.The Swans midfielder reaches the double hundred milestone against Geelong on Friday, but its a mark he didnt expect to attain when he made his first tentative steps into senior footy nine years ago, playing just two senior games in his first season.Following in the footsteps of a famous sporting father is never easy.Jack had the added burden of trying to prove he was proficient at a different code to rugby league, the sport in which his dad Garry excelled and was considered one of the best of all time in his position.I remember coaching him in the reserves when he was a little back pocket player and there was a lot of question marks on him as a young player coming through, Sydney coach John Longmire said.Hes been able to defy those critics and have a wonderful career to this point and hes still playing really good football.Jack has produced a winning and engaging style, both on and off the field, and the latter was never more evident thhan in the past week.dddddddddddd.Grilled by the media over a family feud, Jack answered his interrogators politely and with admirable composure and eloquence, earning the thanks and admiration of several members of the media pack.Now in his fourth season as a co-captain no-one doubts Jacks leadership qualities, but they werent obvious when when he started at the club, according to Longmire.I didnt see it from early on, Longmire said.But what comes out over the period of time is hes a very tenacious person and player and hes able to apply himself and hes got some great athletic qualities.But his ability to be able to get better and better and better and keep improving himself all the time is a real credit to himself.Hes a player that has grown up in Sydney and NSW and had some challenges as far as learning the game from an early age.But hes grasped it with both hands and done a wonderful job so far and hes still got plenty of great footy left in front of him. 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