A lights-out Petra Kvitova pulled off the biggest upset of the year on Friday, snapping Serena Williams' 27-match winning streak in a stunner at the Mutua Madrid Open.
WTA Staff

MADRID, Spain - Looking as powerful and inspirational as ever, Petra Kvitova pulled off the biggest upset of the year on Friday, beating Serena Williams in a semifinal stunner at the Mutua Madrid Open.

Watch highlights, interviews and more video from Madrid right here on wtatennis.com!

Not only had Williams beaten Kvitova in all five of their previous career meetings, but the American went into the match with a number of gargantuan winning streaks - she'd won 19 straight matches in Madrid, 27 straight matches on the tour and, perhaps most impressive of all, 50 straight matches at Premier Mandatory-level events, a streak that dated all the way back to the Miami Open in 2012.

But this was Kvitova's day - from start to finish she played lights out, ripping her huge serve and groundstrokes into the corners for winner after winner, actually finishing the match with a more-than-impressive +11 differential of winners-to-unforced errors (25 to 14). Meanwhile Williams was clearly rattled by the Czech's form, finishing with a -12 winners-to-unforced errors differential (17 to 29).

There were a few tense moments near the end as Williams started closing in, tightening the score from 6-2, 5-1 to 6-2, 5-3, then going up 30-0 on her serve in the next game, but it was too little too late, and the No.4-seeded Kvitova closed out No.1-seeded Williams after an hour and 13 minutes, 6-2, 6-3.

"For sure I'm happy I won today," Kvitova said in her on-court interview straight afterwards.

"I had never beaten her, so it's a really special moment for me."

Williams was asked to assess the match in her post-match press conference.

"Yeah, I think she just played well today," Williams said. "I mean, she went for broke on every serve, every return. I hit some second serves, 170, 175, and she just hit them for winners. I was very slow off the mark. After my serve I wasn't moving as well as I should have. You know, I wasn't in it.

"I wasn't Serena today. I think that was the main thing."

The win represented Kvitova's third over a World No.1, having beaten Dinara Safina in the third round of the US Open in 2009 and Caroline Wozniacki in the round robin of the WTA Finals in 2011.

Awaiting Kvitova in the final is Svetlana Kuznetsova, who pulled off almost as big of a surprise in the first semi, beating No.3 seed and defending champion Maria Sharapova, 6-2, 6-4 (read more here).

Kvitova leads Kuznetsova in their head-to-head, 3-1, though Kuznetsova did win their last meeting.