The world number one Rafa Nadal won a battle of attrition against fellow left-hander Yoshihito Nishioka of Japan 7-6 (4) 6-4 to seal Spain’s spot in the final eight of the inaugural Association of Tennis Professionals (ATP) Cup in Perth on Wednesday. Meanwhile, his long-time rival, world number two Novak Djokovic, had an easier outing in Brisbane, strolling past Chile’s Cristian Garin 6-3 6-3 to stay undefeated in the new year. His victory ensures Serbia will travel to Sydney for the knockouts having won all three of their ties. Nadal had to...