This undated photo released by New Line Cinema shows Will Ferrell, right, portraying Jackie Moon and Andrew Daly portraying Dick Pepperfield in the movie 'Semi-Pro.' [Agencies]

Will Ferrell's basketball comedy "Semi-Pro" dribbled to the top of the weekend box office, but it fell short of his previous blockbuster openings in the sports spoof genre, according to studio estimates Sunday.

The New Line Cinema film, starring Ferrell as the owner of a fictional basketball franchise, grossed $15.3 million in its weekend debut. That was lackluster compared to Ferrell's 2006 NASCAR parody "Talledega Nights: The Ballad of Ricky Bobby," which opened at $47 million, and last year's figure skating comedy "Blades of Glory," which earned $33 million in its first weekend.

Box office analysts said "Semi-Pro" likely suffered because it was released during a normally slow season and was rated R, while "Talledega Nights" and "Blades of Glory" were rated PG-13.

"Will Ferrell is always a draw and audiences love him. But this particular weekend is not quite as strong as his earlier efforts," said Paul Dergarabedian, president of the box-office tracker Media By Numbers LLC.

New Line representatives declined to comment. Last week, media conglomerate Time Warner Inc. announced that New Line would be merged with its Warner Bros. Entertainment studio to cut costs and improve profitability.