Australian Open: Kei Nishikori races to complete Japanese fourth-round double

Kei Nishikori made it back-to-back victories for Japan on Saturday by sweeping into the fourth round of the Australian Open. The in-form eighth seed felt his way into the first set against Portugal's 44th-ranked Joao Sousa before romping away to a 7-6 (8/6), 6-1, 6-2 win in 2hr 6min.

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