'Avatar' topped North American box office with an estimated $48.5 million.

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WEEKEND TOP 5 STUDIO ESTIMATES, JANUARY 8-10, 2010

Rank. Movie Title (Distributor)
   Weekend Gross | Theaters | Total Gross | Week #

1. Avatar (Fox)
   $48.5 million | 3,422 | $429.0 million | 4

2. Sherlock Holmes (Warner Bros.)
   $16.6 million | 3,626 | $165.2 million | 3

3. Alvin and the Chipmunks: The Squeakquel (Fox)
   $16.3 million | 3,641 | $178.2 million | 3

4. Daybreakers (Lionsgate)
   $15.0 million | 2,523 | $15.0 million | 1

5. It's Complicated (Universal)
   $11.0 million | 2,955 | $76.4 million | 3

"Source: Box Office Mojo ( http://boxofficemojo.com)"