SATURDAY PM/SUNDAY AM UPDATE: There is now a clear consensus over which motion picture was No. 1 at the box office this weekend. Sly Stallone’s action holdover The Expendables for Lionsgate is the easy winner after a nailbiter Friday. It was followed closely by a newcomer, another of those cheap Fox spoofs, Vampires Suck, which opened Wednesday. In fact, the order of the entire Top 10 kept changing more than usual day to day because no studio could agree on the grosses. In all, there were 5, count ’em, new films opening in North America to almost close out the summer. Yet none of them could break $12.5M by end of Sunday.

Dimension/Weinstein Co’s horror pic Piranha 3D underperformed at the box office despite those higher ticket prices. Warner Bros’ urban comedy Lottery Ticket did a better per screen average considering its middling release. With a CinemaScore of only “B”, The Switch from Miramax (with production costs shared by Mandate/Lionsgate which has foreign) showed size does matter when it comes to theater count and box office order. Jason Bateman steals this rom-com but it’s not likely to stay in play long enough for people to even see his performance. Working Title’s Nanny McPhee Returns barely made a dent in the box office despite an “A-” CinemaScore, but North America is one of the last markets to debut. Universal began opening it internationally in April to grosses over $62.9 million on a $35M budget (with tax incentives).

Top 10 box office grosses:

1. The Expendables (Lionsgate) Week 2 [3,270 Runs]

Friday $4.9M, Saturday $7M, Weekend $17.2M (-51%), Cume $65.6M

2. Vampires Suck (Fox) NEW [3,233 Runs]

Friday $4.4M, Saturday $4.8M, Weekend $12.5M, Cume $18.8M.

3. Lottery Ticket (Warner Bros) NEW [1,973 Runs]

Friday $3.8M, Saturday $4.4M, Weekend $11.4M

4. Eat Pray Love (Sony) Week 2 [3,082 Runs]

Friday $3.7M, Saturday $4.6M, Weekend $12M (-48%), Cume $47.1M

5. Piranha 3D (Dimension/Weinstein Co) NEW [2,470 Runs]

Friday $3.6M, Saturday $3.5M, Weekend $10M

6. The Other Guys (Sony) Week 3 [3,472 Runs]

Friday $3M, Saturday $4M, Weekend $10.1M, Cume $88.1M

7. The Switch (Miramax) NEW [2,012 Runs]

Friday $2.7M, Saturday $3.3M, Weekend $8.1M

8. Nanny McPhee Returns (Working Title/Universal) NEW [2,784 Runs]

Friday $2.6M, Saturday $3.3M, Weekend $8.3M

9. Inception (Warner Bros) Week 6 [2,401 Runs]

Friday $2.1M, Saturday $3.4M Weekend $8.2M, Cume $262.2M

10. Scott Pilgrim vs The World (Universal) Week 2 [2,820 Runs]

Friday $1.6M, Saturday $1.9M, Weekend $5M (-53%), Cume $20.5M