The contest was on a knife edge throughout the first set, with serve holding out until Muguruza broke through in the 11th game.
"Two years ago I lost in the final against Serena and she told me one day I was going to win", she added. Saturday's win comes two years after she lost on Wimbledon's Center Court to Serena Williams.
Asked to send a message to her absent coach Sumyk, Muguruza lifted her trophy to the camera and said: "Here it is".
Muguruza finished with 14 winners to 11 unforced errors.
She says she refused to consider retirement, despite her world ranking plummeting to 103 by the end of 2011.
She came close to achieving that, but Muguruza would not allow it. This year has been amazing in terms of my play, playing deep into the big events.
She then applied serious pressure to the Williams serve amid a series of uncharacteristic double faults, but eventually let her opponent off the hook. Rybarikova was just rushed the whole time. I believe I can do that.
Pacto de silencio entre Latorre y Jaitt
Por su parte, Latorre no dijo una sola palabra y solo se detuvo para tomarse una foto con un seguidor. Además, detalló: " A partir de ahora, ninguno podrá hablar del otro, ni las familias de ambos ".
The second set was over in a blur, with Muguruza hammering accurate shots and Williams struggling to regain any sense of momentum. Williams started 2017 with a bang, reaching the finals of the Australian Open. "And here I am". It is 23-year-old Garbine Muguruza.
She said: 'Oh I miss you. "The last time she played Serena so I'll have to ask Serena for some pointers", informed Venus. They have never before played on grass, though. At Wimbledon she was coached by Conchita Martinez as Sumyk did not attend the championships.
It was an anticlimactic conclusion for Williams, who was the oldest Wimbledon finalist since 1994. "Every tournament's different. This is most certainly a very different tournament", she said.
It was Muguruza's first Wimbledon title and second Grand Slam title. She played incredibly well, and also surpassed Maria Sharapova for second on the all-time career money list with $37.9 million. Serena is No. 1 at $84.4 million.
"I've had a great two weeks and I'm looking forward to the rest of the summer". Cilic would join countryman Goran Ivanisevic, the 2001 Wimbledon winner, as the only Croatians to win the Wimbledon title.