Angelique Kerber revealed she feels she can beat anyone following her quarter-final win at the US Open.
The German eased past 2015 finalist Roberta Vinci in straight sets on Arthur Ashe Court to reach the semi-finals in New York for the second time.
"I think the key of the match was the first set," the 28-year-old said after the match.
"I mean, it was really close and tough. It's always difficult to play against Roberta.
"Keeping my mind a little bit relaxed, and staying in the moment – I think that was my key. Also for the first set to, be a little bit more relaxed and had not too negative, actually."
Kerber – who defeated Serena Williams to win the Australian Open in January – added that she has been full of confidence at Flushing Meadows.
"I think I have right now more confidence going out there," she added.
"I'm not thinking about quarters, semis, or whatever. I'm just going there to playing a good match and to win.
"I know that I can beat everybody, and this is what gives me also a lot of confidence and motivation for going out there and playing with a lot of emotion."