Warner Bros.’ “Harry Potter and the Half-Blood Prince” won the opening day Quidditch match at the worldwide box office, jumping the $100 million mark in its first 24 hours.

Pic cumed a potent $58.2 million domestically and $45.9 million internationally for a total tally of $104 million — the best start ever for the franchise.

No other studio dared open a big title this weekend, although a handful of specialty pics open at the domestic B.O. in a counterprogramming maneuver.

Titles include Fox Searchlight’s offbeat comedy “500 Days of Summer,” starring Joseph Gordon-Levitt and Zooey Deschanel. Directed by Marc Webb, pic preemed at this year’s Sundance Film Festival and will go out in 27 theaters.

Boaz Yakin’s drama “Death in Love” is likewise skedded to open in limited markets. Distributed by Screen Media Films, the film stars Jacqueline Bisset, Josh Lucas, Lukas Haas and Adam Brody.