Nishikori enters last 16 in Australian Open

Melbourne, Jan 19: Japan's Kei Nishikori defeated Portugal's Joao Sousa in straight sets on Saturday to book his place in the fourth round of the Australian Open.

The eighth seed overcame a tight start and routed his opponent 7-6(6), 6-1, 6-2 in two hours and six minutes, reports Efe.

"I love to play on this court. I feel very comfortable, and it's been three in a row playing here," Nishikori said after the match.

"Everything is doing well – I had a very good off-season, then winning Brisbane, it's been a good start to the year. I finished in three good sets today, I'm playing good tennis, and very much looking forward to next week," he added.

Nishikori coughed up a break in the opening game, but recovered to level up at 2-2.

Sousa saved a virtual set point to hold for 5-6 before Nishikori sent the opener into a tiebreak.