SAN FRANCISCO (Reuters) - Following are the top 10 films at the North American box office for the weekend beginning Friday, led by "Meet the Spartans," according to studio estimates compiled on Sunday by Reuters.

1 (*) Meet the Spartans .................. $ 18.7 million

2 (*) Rambo .............................. $ 18.2 million

3 (2) 27 Dresses ......................... $ 13.6 million

4 (1) Cloverfield ........................ $ 12.7 million

5 (*) Untraceable ........................ $ 11.2 million

6 (4) Juno ............................... $ 10.3 million

7 (3) The Bucket List .................... $ 10.2 million

8 (11)There Will Be Blood ................ $ 4.9 million

9 (5) National Treasure: Book of Secrets . $ 4.7 million

10 (7) Mad Money .......................... $ 4.6 million

NOTE: Last weekend's ranking in parentheses. * = new

release.

TOTALS TO DATE

I Am Legend ......................... $251.7 million

National Treasure: Book of Secrets .. $203.7 million

Alvin and the Chipmunks ............. $201.0 million

Juno ................................ $ 95.7 million

Cloverfield ......................... $ 53.7 million

The Bucket List ..................... $ 52.9 million

27 Dresses .......................... $ 36.0 million

Atonement ........................... $ 35.9 million

First Sunday ........................ $ 31.8 million

Meet the Spartans ................... $ 18.7 million

"Meet the Spartans" and "27 Dresses" were released by Twentieth Century Fox. "Juno" was released by Fox Searchlight. Both are units of News Corp.

"Rambo" was released by Lionsgate, a unit of Lions Gate

Entertainment Corp.

"Cloverfield" was released by Paramount Pictures, a unit of

Viacom Inc.

"Untraceable" was released by Screen Gems, a unit of Sony Corp.

"The Bucket List" was released by Warner Bros. Pictures, a unit of Time Warner Inc.

"There Will Be Blood" was released by Paramount Vantage, a unit of Viacom Inc.

"National Treasure: Book Of Secrets" was released by Walt

Disney Pictures, a unit of Walt Disney Co.

"First Sunday" was released by Screen Gems, a unit of Sony Corp.

"Mad Money" was released by Overture Films, a unit of Liberty Media Corp's Starz cable channel operator.