She wasn't a teen prodigy like Coco Gauff, who she beat en route the title. Over the past two years, she has improved her performances on all surfaces, since the Washington Post reports that she once lacked the belief that she could ever feel comfortable in competing on Wimbledon's grass.
The win marked Halep's second major singles title - she previously won the the French Open in 2018.
Watching her daughter do that - and win - her mum Tania had no more words.
Didn't take long on Saturday for the 27-year-old Halep to demonstrate this was not going to be easy for Williams.
"I think she was getting so many balls back", the 23-time Grand Slam champion said. The past two meetings were also on the Grand Slam stage.
Her work ethic, for once.
Fans cheered for every point the Swiss great won and let out groans when some of his shots were called out. "I always play well when I have emotions. He told me: 'Any time you want, you can come, have dinner, have lunch, playing a little bit tennis.' I will come for sure". Again, I just think Simona just played her heart out.
Since winning the first of her slams at the 1999 U.S. Open, Williams has lost only nine finals at the tournaments that make up the Big Four in tennis. She didn't merely play defense, though, managing to go from retrieving an apparent point-ending stroke by Williams to lashing a victor of her own in a blink. "Chill' has been her mantra this year". But since, she has turned a new leaf.
Halep also earned £2.35million for her win.
This Wimbledon, she was nearly a different person.
"She literally played out of her mind".
But Williams said this is far from her last tournament.
And it showed, the "Halepeno" found the chill all right.
Another onlooker claimed the ovation for Kate and Meghan exceeded that for the players as they made their way onto the court. "It's whatever makes her happy - it's not about us".
It took Halep just 26 minutes to take the first set.
Then in a great and wondrous rush it finally hit her. She leaned forward and yelled, "Come on".
"She didn't say anything because she was crying", smiled Halep.
The quarterfinals against Zhang turned to be her toughest test. She pushed for a tiebreak at 6-6 and cruised in the second set 6-1.
On a cloudy, cool afternoon, with the temperature a low 20 degrees Celsius, Halep began with a pair of service breaks and even delivered the match's first ace, at 171 kilometres per hour, which put her out front after 11 astonishing minutes. She broke Svitolina's serve in all games, but had to fend off five breakpoints and too many deuce games of her own.