NEW YORK—We call Garbiñe Muguruza “Muguruthless” when she’s on her game, and she had been on it for the last two months. Wimbledon, Cincinnati, the first week of the US Open: The 23-year-old Spaniard had never put together such a sustained run of world-beating tennis. She was the favorite to win the Open when it began, and despite being dropped into a powerhouse quarter, she was still the favorite when she took the court against one of those powerhouses, Petra Kvitova, on Sunday night.
Through the first five games, there was no reason to revise that assessment. If anything, Muguruza looked more ruthless—intelligently ruthless—than ever. She jumped to a 4-1 lead over one of the few opponents who, when she’s timing the ball well, has the potential to hit her off the court. Muguruza was holding her own, pace-wise, with Kvitova, and beating her when it came to placement and consistency. The blend of aggression and margin that she had found over the summer was starting to look invincible.
At 1-4, Kvitova faced two break points; lose one of them and the set was all but finished. She saved the first with a service winner, and then she hit the most significant shot of the match, a backhand that looked like it might fly out but found the baseline instead. With those break points saved, Kvitova become a different player. On the next two points, she belted a crosscourt forehand winner and sent another down the line for the hold.
The rest of the set was a dogfight, and reminiscent of the baseline tug of war between Muguruza and Venus Williams in the Wimbledon final. Games were long and hard fought, but gradually Kvitova’s superior power began to wear Muguruza down. She broke serve for 3-4 with a blistering pair of ground-stroke winners and won a long service game for 4-4. Perhaps the most telling sign of how the match was trending was the volume of Muguruza’s grunts; as the set progressed and she strained to maintain her edge, they turned to shrieks.