Half-Blood Prince is the new king of the Harry Potter movies. The franchise's sixth installment, Harry Potter and the Half-Blood Prince, grossed an estimated $58.3 million yesterday, the box-office tracking firm Exhibitor Relations reported.  The take is the biggest-ever opening day, by far, for the no-slouch Harry Potter series. Overall, the gross is Hollywood's fourth-highest single-day score ever, running behind only The Dark Knight, this summer's Transformers: Revenge of the Fallen and Spider-Man 3. Half-Blood Prince started off Wednesday with a Dark Knight-besting $22.2 million from midnight screenings.

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