Jeff Bridges’ sci-fi sequel “Tron: Legacy” raced to the top of the box office with a $43.6 million opening weekend, according to studio estimates.

But the weekend proved no picnic for Dan Aykroyd’s family flick “Yogi Bear,” which fell flat at a weak No. 2 with $16.7 million in receipts.

The previous weekend’s top movie, “The Chronicles of Narnia: The Voyage of the Dawn Treader,” fell to No. 3 with $12.4 million, raising its total to $42.7 million.

The boxing drama “The Fighter,” with Christian Bale and Mark Wahlberg, fought its way to No. 4 with $12.2 million.

“The Tourist,” starring Johnny Depp and Angelina Jolie, rounded out the top five with $8.7 million.