Osaka can upset Serena - Nishikori

Kei Nishikori believes fellow tennis player, Naomi Osaka, is capable of defeating Serena Williams in the US Open final.

Nishikori's campaign at Flushing Meadows ended with a straight-sets loss to Novak Djokovic in a men’s semi-finals on Friday.

However, with Osaka, there is still Japanese interest, who lost only one set on her way to women's final, with a loss of 6-2 6-4 against Madison Keys.

She has beaten Williams in Miami this year and her hope is high to win her first major trophy on Saturday to deny Serena Williams of her 24th grand slam title, equaling Margaret Court’s record.

When addressing the media, Nishikori has so much confidence in the 20 years old : "I think she's going to be fine because I was watching yesterday [Thursday], too. She was enjoying playing great tennis all the time.”

“I was really happy to see she was playing unbelievable tennis. I'm sure she is going to fancy her chance to beat Serena.”

"She's playing different level. I think now she can stay with her. I hope she enjoys and play a good level tennis."

Nishikori’s hope of a repeat of his superb performance to 2014 final in New York was cut short as Djokovic trashed him 6-3, 6-4, 6-2.

Djokovic finally looks back to his best after his well documented long-term fitness problems.

"He was playing aggressive. I didn't have the energy to stay with him. He was hitting side to side. It wasn't easy to stay with him."

Nishikori added, “He's playing better everything. He's staying more solid and not giving many free points. Just less unforced errors. Since we played the last clay, he definitely plays better, I'm sure he's in good shape now."