Kei Nishikori: 'I'm yet to play my best tennis'

Kei Nishikori believes that he is slowly beginning to produce his best tennis after seeing off Ivan Dodig in four sets at the Australian Open.

Last year's US Open runner-up was almost taken to five sets by the Croatian in their second-round contest, but after reaching the last 32, the Japanese star is confident that he will continue to improve in his next match.

The 25-year-old told reporters: "I think that I'm getting close. Maybe these couple matches didn't see me play 100%, but I still had good three-set and four-set wins.

"I think it's getting there. I'm playing good. For sure, this match will help for the next match. You know, try to be 100% little by little."

Nishikori will play American Steve Johnson in the third round on Saturday.