Down in the first set and looking in trouble in the second, the two-time Grand slam victor fought her way back to edge out Barty in a three-set thriller 1-6, 7-5, 7-6 (3).
"It took me a little to get used to conditions out here", Barty said.
This week Alex didn't drop a single set, and he impressed on Saturday when he won the semifinal against Gilles Simon in the morning (6-3 6-2) before beating in the evening Andreas Seppi in the final 7-5 7-6 (5).
"I'm very happy with my performance".
"I knew coming in that if I wanted to come away with a trophy, I was going to have to play two really tough matches", he said. "I really appreciate the support", the young Australian said after reaching the Sydney International final for the second straight year, having lost last year's title to Russia's Daniil Medvedev, reports Efe news.
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However, Keown finds it staggering that the north London club are willing to let one of their prized assets leave for nothing. The worrying part was that Wenger was not able to convince these players, who left in quest of big trophies to their rivals.
The first set appeared to be heading towards a tie-break until De Minaur broke in the 12th game, attacking Seppi's forehand to force errors and earn short balls in return from his opponent.
The Czech 2015 champion and fifth seed fought back from dropping the opening set and an early break in the final set to beat the top-ranked Aussie, 1-6, 7-5, 7-6 (7/3) in two hours 19 minutes.
Meanwhile he has never played against the veteran Seppi, who is set to feature in his first final in three-and-a-half years. He'll face Pedro Sousa Monday in Melbourne with a chance at Rafael Nadal in the third round on Friday.
In turn, it also handed Barty her second straight runner-up finish in Sydney, after losing to Angelique Kerber in last year's final.
De Minaur is happy to be sharing the spotlight with his fellow 2018 Newcombe Medallist Barty.
She more than doubled her prize money courtesy of the win over the wildcard Ho, earning $85,000, and it is just reward after she took a punt on a USA college scholarship to Vanderbilt University in Nashville after sustaining a broken ankle early in her career. If both progress as they hope, the would meet in quarter final.