“I feel better now”. She is the oldest woman ever to be ranked number one worldwide, and the oldest to win a majors title in over 45 years. Then the emotion of the occasion became too much. After the two players hugged at the net, Williams hopped up and down on the side of the court with her arms above her head.

When Steffi Graf was going for the Grand Slam in 1988, the German legend said the pressure going into the final major of the year in New York was “suffocating”.

The American’s 21st Grand Slam crown and the 68th tour-level title earned her a check for £1.8 million. “If I can do the Serena Slam, I’ll be OK heading into the Grand Slam. I was like, ‘What can I do?'” Muguruza said.

On the end of the match when there was a freaky pause before result was announced: “I didn’t hear her (the umpire) say, Game, set, match”. She established herself as a rising star over the past two weeks.

Williams, No. 1 in the rankings and seedings, was a heavily favorite over Muguruza, even though a year ago, Muguruza, a clay court specialist, beat Williams in the second round of the French Open. “I was more focused on winning Wimbledon”, she said.

For the 20th-ranked Muguruza, the problem was Williams.

“If I can do the Serena Slam, I think I’ll be OK”, she said. “It’s just overcoming those feelings and being the best that I can on that day”.

“It’s probably the only thing she hasn’t done yet”, said Patrick Mouratoglou, Williams’ coach. Who knows? Physically I feel better than I have generally when I was younger. I’m that player that always looks over, is that okay?

From 4-2 down in the first set, Williams kept running off five straight games to take the set and go up 1-0 in the second. She appeared to be nervous and had a rocky start. He’s strong No. 1. “That’s what I saw today”.

Then, she’ll travel to the Swedish coastal town of Bastad to play a tournament on clay that starts Monday. She first achieved the Serena Slam in 2002-03, so by winning Wimbledon this year has only equalled what she has done before.

Martina Hingis keeps adding to her collection of Wimbledon trophies. Williams would go on to get the break back and win the first set 6-4.

Victory at Flushing Meadows would also put Williams equal with Graf, who holds the Open era record with 22 Grand Slam titles.

The 34-year-old Swiss player, already a member of the global Tennis Hall of Fame, teamed up with Sania Mirza of India to win the women’s doubles title on Saturday.

Garbine Muguruza of Spain pauses between points during the women’s singles final against Serena Williams of the United States at the All England Lawn Tennis Championships in Wimbledon, London, Saturday July 11, 2015. But she showed again here that even when she had stress, she managed to shake free and win. “I’ve been taking time every match”. I had a really tough draw here.