Keys ousts Muguruza to make Stanford final

Madison Keys upset Wimbledon champion Garbine Muguruza at the Stanford Classic on Saturday, defeating the Spaniard in straight sets to set up an all-American final with Coco Vandeweghe.

Keys handed Muguruza her first defeat in nine matches to make the final in 57 minutes with a comfortable 6-3, 6-2 victory.

Number three seed Keys needed a single break in the first set, then broke Muguruza again to lead 3-1 in the second set, breaking once more to wrap up the match.

In the first semi-final, Coco Vandeweghe defeated US teenager CiCi Bellis with a strong performance.

Vandeweghe earned her second final at Stanford appearance in style, giving up just four games as she reached the final without dropping a set.

Her first appearance in the decider was five years ago when she lost to Serena Williams.

"I'm five years older, and hopefully more mature," Vandeweghe said in her post-match interview.

"I think [I'm] a little bit of a different tennis player. You grow and evolve as a tennis player and as a person, and I think especially in the last two years, it's been kind of clicking in that regard."