“Won’t Back Down” took in a rough $2.6 million its opening weekend, according to Box Office Mojo, setting the record for worst opening of a film that released in over 2,500 theaters. The flick beat Rainn Wilson’s “The Rocker,” Drew Barrymore’s 2007 romantic drama “Lucky You,” Luke Wilson’s family comedy “Hoot” and Jennifer Aniston’s “Rumor Has It” for the dubious honor.

“The Rocker” had been in the top spot since 2008…