Nadal made to work for victory over Nishikori

Rafael Nadal progressed through to the quarter-finals of the Australian Open with a straight sets victory over Kei Nishikori, but it was a far from comfortable outing for the world number one.

Nadal had won all five of his previous meetings against Nishikori and, while he made it six out of six on Monday, he was pushed hard by his Japanese opponent before sealing a 7-6 (7/3) 7-5 7-6 (7/3) win at Rod Laver Arena.