"I can not tell you how much I love you for what you did for this man", Cowell said after Ketter's incredible appearance.
Hadwin had been among the favourites to win the talent competition show after judge Howie Mandel, 62, used his Golden Buzzer during auditions to advance her in the competition. "You have to respect that this is a competition", Simon said.
The performances on America's Got Talent are just snippets compared to what the group is capable of. "I think the world does too, we are watching a superstar in the making right here on "America's Got Talent".
Courtney was in the final pair alongside her fellow singer, Michael Ketterer.
He won't be alone, as he will be joined by Light Balance, another troupe of America's Got Talent finalists, as well as other illusionists including Darcy Oake and Chloe Crawford.
The only magician in the top 10 is Shin Lim. In the semi-finals, Hadwin performed a cover of Steppenwolf's 1968 hit Born To Be Wild and was described as a "bundle of excitement" by Cowell. "The hardest thing you'll ever do is tell someone you're sorry/ You'll never be the bravest man if you can't admit you're scared", the lyrics read, giving Ketterer plenty of complexity within the track to draw emotion from and connect to as a 41-year-old man. "You were fantastic. My prediction is you're going to be the victor".
Before the results were announced, Courtney posted on social media saying it had been "an awesome journey" and that she's "loved every second of it".
Weeks ago, after Ketterer's powerful performance during the quarter-finals round, Simon Cowell called out Brooks and challenged him to pen an original tune for the hopeful to sing during the finals.
But who stands the best chance of winning this season of America's Got Talent?