In what has likely been the biggest upset so far in this competition, Black Sabbath legend Tony Iommi was defeated by Avenged Sevenfold's Synyster Gates. The Avenged strummer has pulled off two insane wins already; also beating the one and only Steve Vai in Round 1. The dedication of A7X fans seems unmatched at times, which will make this round all the more interesting.

Late Slayer shredder Jeff Hanneman also advances to the Quarterfinals of our Greatest Metal Guitarist poll. Having trounced Suffocation's Terrance Hobbs in Round 1, Hanneman gained another win in Round 2, this time in a closer match against Joe Satriani. Hanneman now faces Gates to determine who advances to the Semifinals.

Synyster Gates or Jeff Hanneman? Cast your vote for the Greatest Metal Guitarist in the poll below! Voting for this round closes on Sunday, Aug. 4 at 11:59PM ET. Fans can vote once per hour, so keep coming back to make sure that your favorite metal musician wins!