Garbine Muguruza led Serena Williams 4-3, 15-0 in the first set when she stepped to the middle of Centre Court to hit a forehand. It was the kind of shot that she had been putting away routinely for the last two weeks, and for the first 30-odd minutes on Saturday. The 21-year-old Muguruza, to the surprise of many—but not to her or her opponent—had come out for her first major final and taken the initiative from the world’s best player. It was Muguruza, not Williams, who was swinging freely and aggressively, and who recorded the first service break. It was Williams, not Muguruza, who was so worried about her opponent’s powerful return that she double-faulted three times in her first service game.

Now, though, as Muguruza stepped forward for that forehand at 4-3, she could begin to see the outlines of the first-set finish line. She may have walked on court expecting to play well against Serena, but winning? That’s another level of belief entirely. Whatever Muguruza thought, she thought it for a split-second too long. She hesitated with her swing; instead of rocketing a winner, she blooped the ball back, well within her opponent’s reach.

That, it turned out, was all Serena needed. She was behind the baseline and ready to play a defensive shot; most other players in that situation would have just tried to get the ball over the net. But that was never going to be the Serena way. This was a chance not just to make a shot, but to send a little piece of information down to the woman at the other end of the court. Serena changed her stance and ripped a forehand crosscourt. Muguruza couldn’t handle the pace, and, it was soon clear, she couldn’t handle the information that Serena was imparting. Muguruza lost that point, her serve, the set, and eight of the next nine games.

“The first six games were really tough,” Serena’s coach, Patrick Mouratoglou told ESPN afterward. “She expected Garbine to be aggressive on second serves, she started to double fault and lost confidence in her biggest weapon.”

When Serena ripped that forehand after Muguruza’s mishit, Mouratoglou also understood what she was trying to say. It was music to his ears. To him, a match with Serena is never about what the score is at a given moment, or how her opponent is playing. It’s all about where she is mentally and how she’s feeling.

“Serena sent a message,” Mouratoglou said of that forehand at 4-3. “‘Now I’m here.’”

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Catching Up to Herself

Catching Up to Herself

No wonder Muguruza stopped playing so freely and confidently; the simple fact that Serena was “here” meant her chances of winning had plummeted. It wasn’t just that Serena hit with more power than Muguruza. What struck me as I watched Serena stretch her lead wasn’t her superior power, but her superior variety and creativity.

After the opening stretch of games, Serena began to read Muguruza’s serves and returns. She began to anticipate Muguruza’s wide serve to her backhand in the ad court, as well as her backhand return down the line. Once that happened, Muguruza couldn’t find a way to mix things up.

At the same time, Serena found ways to surprise Muguruza as the match went on. She won an important point with a second serve down the T in the ad court, where she usually goes wide. She won another at a crucial stage in the second set when she pulled a backhand crosscourt instead of going down the line and into the open court.

Serena has signature shots—the rifle-crack serve, the “get-out-of-here-with-that-nonsense” return—but what makes her tough to read is that she doesn’t have signature shots to specific places. She can go down the T or wide with her first serve equally well, and can place the second serve in either corner. On her ground strokes, she can go down the line, crosscourt, or at an acute angle with the same effectiveness.

By the middle of the second set, the Serena onslaught had set in, and Muguruza, who would lose 12 straight points from 1-2 to 1-5, couldn’t find an answer.

“When I lost the first set, I was a little bit sad,” Muguruza said, “because I had chances. I just tried to keep going, but she was playing really good—aces, winners, what could I do?”

All Muguruza could do was hang around and hope that Serena would get, as the Spaniard said, “nervee-us.” That’s exactly what happened. Serena, as she did while trying to close out the French Open final last month, tightened up, and Muguruza was ready for it. In the end, though, she had fallen behind by one game too many.

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Catching Up to Herself

Catching Up to Herself

Afterward, Serena applauded a tearful Muguruza’s efforts, and assured her she would be holding the Wimbledon winner’s plate someday soon. Muguruza appreciated the words, though she didn’t sound completely convinced by them in her press conference later. What she did sound convinced of was her ability to play with the world’s best.

“I have a good level,” Muguruza said, “I have to believe that. Here I have the proof...I felt free on the court, no fear.”

Twelve months ago, another 21-year-old, Genie Bouchard, sat in the same chair after being trounced in the same round by Petra Kvitova. The loss was bad enough that it appears to have left a deep scar in Bouchard’s game; she has rarely been the same player since. By all appearances, this loss wasn’t a scarring one for Muguruza, who won the crowd, the press, and her opponent over with her easygoing confidence and thoughtful, brave game. I especially liked what she said about the process of being successful.

“I learned that every match is very important,” Muguruza said, when asked what she had discovered during her Wimbledon run. “First rounds are really hard because you are nervous. [But] if you get through all these situations and you’re mentally tough, you have the chance to play this kind of match.”

No one knows more about this process, and getting through these situations, than Serena Williams. According to her, this match was definitely a process, from the practice court to the final game.

“In practice, my serve was off,” Serena told ESPN. “I didn’t feel it...But I kept going after it."

Then, when she did find it, and everything was finally clicking, she had to stop from getting ahead of herself.

“[At 5-1 in the second set] I definitely started thinking, ‘One game, Serena Slam,’” she admitted, “and that’s the wrong way to think.”

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Catching Up to Herself

Catching Up to Herself

But as she has all season, Serena survived her nerves. This time, she said did it by being what most tennis players can never be in the middle of a match: Reasonable with herself.

“[At 5-4], I told myself, ‘worst-case scenario, you'll be in a third set.’" Serena said. "‘Best-case scenario, you’ll close it out.’ I kind of calmed down after that, and I was able to do better.”

Watching Serena carve up the court and roll toward the title in the second set, I tried to remember her last Serena Slam, in 2003 and 2004. What came to mind was the sight of her doing the same thing—carving up the court with a dazzling variety of angles—to beat her sister Venus in the U.S. Open final.

A lot has changed since then, obviously, to a woman who has survived a pulmonary embolism and the death of a sister in the interim. In those days, at 21, with the sport in the palm of her hand, Serena appeared to be fearless. Now no big match of hers seems complete without an attack of nerves for her to fight off. Back then, she has said, she was driven by the thought of getting revenge on an ex-boyfriend. This time she was coaxed and coached the whole way by Mouratoglou, and they shared an open-armed hug when it was over.

Afterward, Serena said that the thought of another Serena Slam, of matching her younger self, was what drove her the most in 2015.

“I’ve been trying to win four in a row for 12 years, and it hasn't happened,” Serena said. “I had a couple of injuries. It’s been an up and down process. I honestly can’t say that last year, or even five years ago, I would have thought I could win four in a row.”

She seems to appreciate this Serena Slam, and the difficulty in achieving it, more than the first time around. For of all her experience at 33, nothing can match the brashness of a world-beating athlete at 21.

Serena has spent the last three years leaving the field behind. At the U.S. Open next month, she'll have a chance to catch up to the last great women's champion, Steffi Graf. But it was easy to understand why, for now, Serena seemed pleased to have caught up to herself.