Walt Disney Pictures are reporting an opening day of $80.5 million for Marvel's The Avengers in 4,349 theaters nationwide, building upon the $18.7 million from midnight screenings the night before. If this number sticks, it will be the second biggest opening day for a movie ever, following behind the $91 million grossed by Harry Potter and the Deathly Hallows - Part 2 its opening day last summer.