'Semi-Pro' scores at box office, but it's no slam dunk

• Story Highlights
• Will Ferrell's latest sports spoof makes $15.3 million in its debut weekend
  
• That's less than half of what "Talladega Nights" and "Blades of Glory" opened with
  
• In "Semi-Pro," Ferrell is the owner of a fictional basketball team
  
• "Vantage Point," last week's top film, finishes in second with $13 million
  
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