Jan 22 (Reuters) - Scott Jamieson retained a one-shot lead going into the final round of the HSBC Championship in Abu Dhabi after a four-under-par 68 on Saturday ahead of Shane Lowry and Thomas Pieters. Scotland"s Jamieson struck five birdies, including one on the final hole, to finish on an 11-under-par total. Irishman Lowry and Belgium"s Pieters, who matched each other with bogey-free rounds of five-under 67, piled the pressure on Jamieson but the Scot showed great composure in his fight for a second title on the European Tour. "After yesterday, certainly the whole day seems a little more straightforward but it still wasn"t easy," said Jamieson, who won his first title in 2013. "The greens were considerably quicker and there was still a decent amount of breeze. "It would be massive, a game-changer, to win a tournament of this stature. There"s definitely been some great champions here, and that"s an awful long way to go." India"s Shubhankar Sharma and Norway"s Viktor Hovland sat in a share of fourth place on eight-under, while Spain"s Rafa Cabrera Bello was a shot further back alongside Englishmen James Morrison and Ian Poulter. Four-time major winner Rory McIlroy carded a five-under 67 to reach two-under for the tournament, while world number two Collin Morikawa sat on two-over after a third-round 71.