LOS ANGELES — Neither a hyper intelligent robot nor Vince Vaughn could save the box office this weekend, which is down 38.5 percent from the same weekend last year according to Sunday estimates from box office firm Rentrak.

While Neill Blomkamp’s R-rated “Chappie” might have taken the No. 1 spot in its 3,201 theater debut, its modest $13.3 million gross is hardly anything to celebrate.

It’s a career low for Blomkamp, whose previous films “Elysium” and “District 9” debuted at $29.8 and $37.4 million, respectively.

Distributor Sony remains optimistic about its $49 million film about a police robot (voiced by Sharlto Copley) who learns how to think and feel.

“It certainly opened in our realm of expectations for it for the weekend,” said Rory Bruer, Sony’s President of Worldwide Distribution. He noted that the 60 percent male and 57 percent under-30 demographic breakdown was good for the film.

Sony and its subsidiaries have released all three of Blomkamp’s films.

“I certainly believe, like Neill’s other movies, that it’s going to have a really strong multiple and we’re going to come out fine on the movie,” Bruer said.

The R-rated Vince Vaughn comedy “Unfinished Business” fared even worse, opening at No. 10 to a dismal $4.8 million. The $35 million film about a chaotic European business trip also stars Dave Franco and Tom Wilkinson.

In its second weekend in theaters, Will Smith’s “Focus” fell an estimated 46 percent to take second place with $10 million, bringing its domestic total to $34.6 million.

“These are not exactly world class numbers,” said Paul Dergarabedian, Rentrak’s senior media analyst.

“This is two weekends in a row where we’ve seen original R-rated movies just not resonate with audiences with “Focus” last weekend and “Chappie” this weekend,” he said.

One bright spot was Fox Searchlight’s retiree comedy “The Second Best Exotic Marigold Hotel,” which opened in third place with a strong $8.6 million from 1,573 locations.

“It’s one of the very rare instances of an indie sequel. You normally don’t see that,” said Dergarabedian. The PG-rated film, which reunites Judi Dench, Maggie Smith and Bill Nighy, will be expanding to about 1,800 screens next weekend.

The first film was somewhat of a sleeper hit in 2012, grossing $46.4 million domestically on a budget of $10 million.

Holdovers “Kingsman: The Secret Service” and “The SpongeBob Movie: Sponge Out of Water,” rounded out the top five with $8.3 million and $7 million, respectively.

“This is the proverbial calm before the storm. We’re still on track for a massive, record-breaking year. But there are going to be a lot of casualties along the way and we’re seeing that right now,” Dergarabedian said.

Estimated ticket sales for Friday through Sunday at U.S. and Canadian theaters, according to Rentrak. Where available, the latest international numbers for Friday through Sunday are also included. Final domestic figures will be released Monday.

1. “Chappie,” $13.3 million ($13.7 million international).

2. “Focus,” $10 million ($17.7 million international).

3. “The Second Best Exotic Marigold Hotel,” $8.6 million ($5.6 million international).

4. “Kingsman: The Secret Service,” $8.3 million ($17 million international).

5. “The SpongeBob Movie: Sponge Out of Water,” $7 million ($9.6 million international).

6. “Fifty Shades of Grey,” $5.6 million ($17.7 million international).

7. “McFarland, USA,” $5.3 million.

8. “The Lazarus Effect,” $5.1 million ($700,000 international).

9. “The DUFF,” $4.9 million.

10. “Unfinished Business,” $4.8 million ($2.6 million international).

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Estimated ticket sales for Friday through Sunday at international theaters (excluding the U.S. and Canada), according to Rentrak:

1. “Jupiter Ascending,” $25.3 million.

2. “Big Hero 6,” $19.6 million.

3. “Focus” and “Fifty Shades of Grey,” $17.7 million.

4. “Kingsman: The Secret Service,” $17 million.

5. “American Sniper,” $14.6 million.

6. “Chappie,” $13.7 million.

7. “From Vegas to Macau II,” $11 million.

8. “Dragon Blade” and “Wolf Totem,” $10.5 million.

9. “The Second Best Exotic Marigold Hotel” and “Paddington,” $5.6 million.

10. “Birdman,” $4.4 million.

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Universal and Focus are owned by NBC Universal, a unit of Comcast Corp.; Sony, Columbia, Sony Screen Gems and Sony Pictures Classics are units of Sony Corp.; Paramount is owned by Viacom Inc.; Disney, Pixar and Marvel are owned by The Walt Disney Co.; Miramax is owned by Filmyard Holdings LLC; 20th Century Fox and Fox Searchlight are owned by 21st Century Fox; Warner Bros. and New Line are units of Time Warner Inc.; MGM is owned by a group of former creditors including Highland Capital, Anchorage Advisors and Carl Icahn; Lionsgate is owned by Lions Gate Entertainment Corp.; IFC is owned by AMC Networks Inc.; Rogue is owned by Relativity Media LLC.

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Follow AP Film Writer Lindsey Bahr on Twitter at: http://twitter.com/ldbahr