Muguruza needed one hour, 17 minutes to secure the win and end the 37-year-old Williams' attempt to become the oldest woman in the Open era to win a Grand Slam title.
"Who among the male finalists, tomorrow night, would you like to dance with?" asked one of the journalists present at the post-match conference. How much she will regret in retrospect allowing a break point to pass at 3-3; and how much more that, at 5-4, she held two points to capture that first set, which was so vital to her challenge here.
The tradition of men and women's singles winner dancing in the Champions' ball on Sunday night haven't been strictly followed since the 1970s, but was brought back in 2015 when Serena Williams and Novak Djokovic shared the dance floor.
The Duke and Duchess of Cambridge are expected to be joined by the prime minister, Theresa May, and the mayor of London, Sadiq Khan. The key is to continue to work hard and to focus in every tournament.
Watched by Spain's former king Juan Carlos, Muguruza, 23, produced a regal display to add the Wimbledon title to her French Open success in 2016. "Today, I played well". Watch our video recap above to brush up on your Game of Thrones knowledge before you lose yourself in season seven. "I was like" 'OK, we are going to do this'". But following that frustration and an inability to live up to her billing she struggled and didn't reach any tournament final until now.
"When I knew I was playing Venus in the final, I was actually looking forward (to) it", Muguruza said.
Martinez does not expect Muguruza to suffer the same letdown as she did after winning the French and hopes she can be more consistent.
The royal box is expected to be full of familiar faces for the final day.
Conchita Martinez, who stood in for Muguruza's regular coach, Sam Sumyk, during his absence for personal reasons over the last fortnight, thinks that the world No 15 will cope better this time around. The greatest woman player could see something in the Spaniard's game then.
Those fans who opted for Rafa Nadal's fourth round match with Gilles Muller were at least treated to a genuine upset with the Spaniard beaten by the inspired journeyman from Luxembourg in a five-set classic.
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