By Nick Mulvenney SYDNEY (Reuters) - Adam Scott holds the upper hand in his duel with Rory McIlroy going into the final day of the Australian Open after the home favorite posted a four-under-par 68 to open a four-shot lead over the Briton on Saturday. Two-time major champion McIlroy looked down and out after a patchy front nine but rallied for a 70 to remain in the hunt for his first win of the year in front of bumper galleries at the Royal Sydney Golf Course. Most of the crowd were backing Scott's bid to secure a "triple crown" of Australian titles and a huge cheer went around the course when he birdied the last to double his overnight lead by reaching 16-under for the tournament. More...