Garbine Muguruza continued her dream debut at the WTA Finals by completing round robin play with a perfect 3-0 record to advance to the semi-finals after a hard fought 6-4 4-6 7-5 victory over Petra Kvitova on Friday.

By topping the White Group, the Spaniard set up a showdown against Poland's Agnieszka Radwanska while Kvitova (1-2) will be banking on her already eliminated Czech Fed Cup team mate Lucie Safarova (0-2) to beat Angelique Kerber to help her advance.

Germany's Kerber (1-1) only needs to secure a set in Friday's second match to book a last four berth against Red Group winner Maria Sharapova but Muguruza was spared the agony of relying on others by claiming a third straight triumph. "It's amazing to reach the semi-finals," Wimbledon finalist Muguruza said in a courtside interview.

"To be here is a great payoff for an amazing year and hopefully I can continue winning and playing like this."

"It was crazy right, oh my gosh," Muguruza added. "Petra is an amazing player and she was obviously playing great. I was so nervous and she made sure I had to concentrate and give it my best and I can't be happier with this ending."

-