“Harry Potter and the Half-Blood Prince,” the sixth installment in the “Potter” franchise, grossed an estimated $58.3 million as reported by box-office tracking firm Exhibitor Relations.

The sixth “Harry Potter” film has seen the biggest-ever opening day thus far for the series. The movie, based on J.K. Rowling’s hit book of the same title, grossed Hollywood’s fourth-highest single-day score, trailing behind “The Dark Knight,” this summer’s blockbuster hit “Transformers: Revenge of the Fallen” and “Spider-Man 3.”

Although “Half-Blood Prince” — starring Daniel Radcliffe, Emma Watson and Rupert Grint — came fourth in terms of opening night figures, it topped “Dark Knight” in the midnight screenings category after the sixth “Harry Potter” movie brought in a hefty $22.2 million in midnight screenings alone.

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