According to early estimates, both films took $13 million each.
They were closely followed by third-placed film, Trouble with the Curve, starring Clint Eastwood and Amy Adams.
But it was another sluggish weekend overall, with revenues – $88 million – down 25% on the same time last year.
“This was a clash of the non-Titans,” said Paul Dergarabedian, analyst for box office tracker Hollywood.com.
“When three films are duking it out for the top spot with only around $13 million, that doesn’t represent a very strong period at the box office.”
British film Dredd had a disappointing opening, going in at number six with $6.3 million.
Perks, Emma Watson’s first film since Harry Potter, took $244,000 but only opened in four cinemas.
The 3D re-release of Finding Nemo was at number four, taking $9.4 million.
Resident Evil: Retribution slipped from the top spot to number five, with $6.7 million.
Other top ten films included The Master and ParaNorman.
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