The Hoyas (11-8) never led by more than two goals, with a 2-1 edge after the first quarter, 4-2 at halftime and 5-3 going into the final period.
Harrison will travel Wednesday to Centennial, which prevented another all-Cobb game by beating Lassiter 13-12 in another quarterfinal. The teams met in the first game of the season, with the Hoyas losing 12-5.
Luke Wittenberg, Damon Cowan and Thomas Justusson each had two goals, with Alex Mowry and Artie Lewis also scoring. Wittenberg, Mowry, Cowan and Lewis had assists.
Mitchell Barnes made 11 saves against the Walton offense.
The Raiders (13-6) were led by Andrew Ashmore’s two goals. Kip Jones, Michael Gernatt, Jack Whittaker and Ryan Jones had one apiece.
Harrison 2, Centennial 1: After allowing the Knights to take the initial lead, the Hoyas rallied back to win the Class AAAAAAA quarterfinal.
In the semifinals for the first time in six years, Harrison (17-3) will travel to Collins Hill on Wednesday.
After Kennett Fosuhene gave the Hoyas the game-tying goal in the first half, Nathan Vickroy had the winner with about 6 minutes left in the game.
Kevin McKay made seven saves including a fingertip stop of the would-be tying goal in the final minutes.
Pope 1, Windsor Forest 0: The Greyhounds scored their lone goal in the 20th minute of the Class AAAAA state quarterfinal when Colin Huber received at pass from Zach McCown at the top of the box.
Afterward, Pope maintained possession and ended up with 17 shots for the game while giving up four.
Pope (14-5-1) may have its hands full Wednesday when top-ranked McIntosh comes to visit in the semifinals.
McIntosh 11, Kell 7: The Lady Longhorns battled to a 4-all tie at halftime, but they couldn’t keep pace in the second half of the Class A-AAAAA quarterfinal.
Sisters Emily and Haley Swift each scored twice, while Leslie Ferguson, Sarah Bialecki and Izzie Palermo also had goals. Haley Swift and Bialecki contributed assists.
Hannah Rosen made nine saves for Kell (14-6).