Round 1 featured a series of interesting match-ups of the top 64 greatest bands of hard rock and heavy metal with several surprising upsets.  Here are the first round results of the 2012 March Madness Heavy Metal Tournament: (Click on bracket to enlarge)

Black Sabbath defeats Posion

Overkill defeats Exodus

Alice Cooper defeats Danzig

Anthrax defeats Tool

Def Leppard defeats Twisted Sister

Pantera defeats Lamb of God

Type-o-Negative upsets Rainbow

Motorhead defeats Tesla

Metallica defeats Quiet Riot

Ted Nugent upsets Accept

Queen defeats Whitesnake

Guns n’ Roses defeats Deftones

Sammy Hagar upsets Deep Purple

Megadeth defeats Fear Factory

Rush defeats Machine Head

Judas Priest defeats Skid Row

Iron Maiden defeats Soundgarden

UFO upsets Mercyful Fate

Van Halen defeats Faith Now More

Aerosmith defeats Rage Against The Machine

Dream Theater upsets Thin Lizzy

Ozzy Osbourne defeats W.A.S.P.

White Zombie defeats Sepultura

Led Zeppelin defeats Testament

AC/DC defeats Korn

Marilyn Manson defeats Diamond Head

Scorpions defeats Warrant

Motley Crue defeats Black Label Society

Avenged Sevenfold upsets Alice in Chains

Kiss defeats GWAR

Dio defeats Ratt

Slayer just edges out Slipknot

Round 2 results will be posted this weekend.