You are not permitted to download, save or email this image. Visit image gallery to purchase the image.
The 14th-seeded Goerges had come into the tournament in strong form having successfully defended her Auckland Classic title but looked uncomfortable against the power-hitting 25-year-old, who went for her shots during the second set.
The tactic paid off for Collins, who sealed the win in two hours, 25 minutes when her winner smacked into the net and the ball flopped into Goerges' side of the court.
"The first set didn't go my way but I had a clear mindset about what I needed to do," said Collins, who was making her main draw debut at Melbourne Park.
"I decided today that I had to earn it the hard way, no easy jobs for me and I just out went there with no fear."