Karolina Pliskova of the Czech Republic returns a shot to Serena Williams of the United States during their Women's Singles Semifinal Match on Day Eleven of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)

Czech Karolina Pliskova is through to the US Open final after defeating world No.1 Serena Williams in straight sets, 6-2, 7-6.

The loss sees Williams relinquish the world No.1 ranking to German Angelique Kerber.

Pliskova broke the Willaims serve twice in the openign set, as the now former world No.1 served six double faults for the match, including on match point to hand Pliskova victory, in an uncharacteristically error riddled match.


Pliskova advanced to her first Grand Slam final, with he previous best result at a slam the third round.

She is the first Czech player to reach the US Open final since 1993 and she becomes just the eighth player in history to defeat both Williams sisters in the same tournament.

The 24-year-old also recorded her sixth win against top-10 opponents this season.

She will face either Caroline Wozniacki or Angelique Kerber in the final.