The club didn't conform because it was out of form -- after Blair whacked himself in the head with it after missing a putt on the fifth green at Quail Hollow Golf Club.
Blair, 25, proceeded to use the club to putt out -- and then noticed that the putter was bent.
He approached a rules official on the sixth tee and explained the situation, which resulted in disqualification under Rule 4-3b because he holed out with the non-conforming club.
Blair could have tapped in with a wedge and played the rest of the round without a putter.
The Rules of Golf allow you to replace a damaged club during a round but not if the damage was done in anger.
Blair was 4 over par at the time and in danger of missing the 36-hole cut. He went to Twitter later to apologize, explaining his actions and taking responsibility.
He also poked fun at himself by posting a video of now-Champions Tour player Woody Austin, who once famously bent a putter in anger by hitting himself in the head.
1 Big Thing: You're just not good enough!
SVP tells the story of Zac Blair who was disqualified at Quail Hollow after bashing his head with a putter. He shares Andy North's advice for amateur golfers, saying, "You're just not good enough at the game to get angry at it when you play poorly."