SYDNEY — Gilles Muller beat second-seeded Pablo Cuevas 7-6 (5), 6-4 on Thursday to advance to the Sydney International semifinals against two-time defending champion Viktor Troicki. Troicki was scheduled to face No. 5 Philipp Kohlschreiber in another quarterfinal Thursday, but the German player withdrew with a back injury, handing third-seeded Troicki a walkover into the
