Tomic is the top seed for this year's junior event. Somewhat of a shock scoreline; the two had a much closer encounter at the Australian Open earlier this year, Tomic beating Brunken 5-7, 6-3, 8-6.
The win lifts Tomic to 9 and 0 at Grand Slams this year.
Tomic plays Guido Pella next, who crushed another Aussie junior, Andrew Thomas, 6-0, 6-4.
Tsung-Hua Yang, who lost to Tomic in the final of the Australian Open, is still in the event. He plays Evgeny Donskoy in the quarterfinals.
The winner of Tomic and Pella plays the winner of Bulgarian Grigor Dimitrov and Polish hope Jerzy Janowicz, seeded fourteenth and twelfth respectively.
In the other half of the draw, the victor of Donskoy and Yang will play the winner of an interesting match-up between Soong-Jae Cho, who defeated ninth seed Ryan Harrison in three sets, and second seed Cesar Ramirez of Mexico, who fell to Tomic in two sets in the quarterfinals of the Australian Open, but is undoubtedly a more formidable opponent on clay.
Draw can be found here