"I've been playing great tennis and felt like if I could keep it all together, the good results will come", he said.
Third-seeded de Minaur, 20, became just the third player to win an ATP title without facing a break point since the tour began keeping stats in 1991.
De Minaur lost just seven first-serve points throughout the week (winning 116 of 123) and became the youngest victor in the tournament's history.
De Minaur will play in his fifth career ATP final on Sunday with his lone title coming earlier this year at the Sydney International. He did not face a break point against the 26-year-old Tomic.Elsewhere, Brit Cameron Norrie prevailed 7-5, 6-4 over Australia's Alexei Popyrin.
"He played really well and I just needed to up it even more if I wanted to win".
The Dutchwoman broke twice in a one-sided first set and three times in the second, failing to consolidate on two occasions as she made hard work of sending the 119-ranked Badosa packing.
De Minaur had claimed the first set 6-2 and was cruising in the second, up 3-0 before his countryman called it quits.
De Minaur broke again to pocket the first set when Fritz's drop shot effort failed to clear the net.
Next up for De Minaur is Opelka, who reached his second Atlanta semi after outlasting Daniel Evans 7-6 (7-3) 7-5.
Norrie will face second-seeded Taylor Fritz who beat Serbia's Miomir Kecmanovic 6-1, 7-6 (7/1)."I'm pumped to get through that".
Norrie fended them off but there was no coming back for him after a massive forehand error at 2-3, pushing Fritz in front and allowing the American to move over the top with four winners in game nine, saving a lovely volley victor for the last point to set the title clash with de Minaur on Sunday.
Cameron Bancroft named in Australia’s Ashes squad
The player who pipped Carey was Matthew Wade , who finally got the rewards for trying hard to get back into the national side. The championship will run for the two years where nine top-ranked teams will play each other in the home and away series.
Vietnam seizes 55 pieces of rhino horn hidden in plaster
Poachers in Africa have decimated wild rhino populations to meet demand despite the trade being banned globally in the 1970s. Tiger parts are used for traditional medicine or jewellery in Vietnam, with many smuggled into the country from Laos.