Brian Robbins wanted his film about an inner-city Little League team to be as realistic as possible.
So he shot "Hardball," which opened at No. 1 this weekend, at a Chicago housing project.
Robbins told Associated Press Television News that it was "extremely rough and scary at times," but worth it.
"I wanted to get the sense of the buildings so we actually built our baseball field right in like the quad of these buildings," he said.
The movie was inspired by Daniel Coyle's book about his time coaching a baseball team in Chicago's housing projects. Keanu Reeves plays Conor O'Neill, who scalps tickets to finance his real occupation: losing heaps of money on sports bets.