American tennis great Billie Jean King said on Wednesday she thinks Johanna Konta is playing "the best" she has in her career so far. The 28-year-old Konta became the first British woman since 1983 to reach the French Open semi-finals with an impressive straight-sets win over last year's runner-up Sloane Stephens on Tuesday, and will face Czech teenager Marketa Vondrousova for a final place on Thursday. It will be Konta's third Grand Slam semi-final, after the 2016 Australian Open and Wimbledon two years ago.

"Konta right now is probably playing the best I've ever seen her play. I think she's actually better now," said 12-time major champion King on Wednesday at an International Tennis Federation press conference in Paris. "She's really concentrating well and she's hitting so big. Her serve is big, her groundstrokes are big. She's totally focused right now. She just has to stay the way she is.