Startup incubator TechStars is holding a bracket-style tournament to find out which startup reigns supreme.

Sixty four startups that have a functional product, but have not been through the TechStars program, and have not yet raised or earned $250,000 will face off against each other in a battle royale for $25,000 in prizes. The tournament winner based on user votes will get Rackspace hosting, free advertising, and other goodies, while semi-finalists get invited to the TechStars for a Day mini-camp, and automatic consideration as a TechStars program finalist.

The voting will start on March 14, and TechStars is taking nominations through March 9. The 64 with the most nominations will make the cut.

Nominations are being accepted through the TechStars web site, and through Twitter by tweeting “Hey @TechStars, I nominate @COMPANY TWITTER NAME HERE for the @StartupMadness Tournament http://tsta.rs/sumadness”